Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1641 insertions, 0 deletions

diff --git a/epan/dissectors/packet-sercosiii.c b/epan/dissectors/packet-sercosiii.c
new file mode 100644
index 00000000..1d54025a
--- /dev/null
+++ b/epan/dissectors/packet-sercosiii.c
@@ -0,0 +1,1641 @@
+/* packet-sercosiii.c
+ * Routines for SERCOS III dissection
+ *
+ * Initial plugin code by,
+ * Bosch Rexroth
+ * Hilscher
+ *
+ * Hans-Peter Bock <hpbock@avaapgh.de>
+ *
+ * Convert to built-in dissector
+ *   Michael Mann * Copyright 2011
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/expert.h>
+#include <epan/etypes.h>
+
+#define MAX_SERCOS_DEVICES (512)
+#define MAX_SERCOS_ADDRESS (511)
+#define SERCOS_SLAVE_GROUP_SIZE (128)
+
+#define COMMUNICATION_PHASE_0 (0x0)
+#define COMMUNICATION_PHASE_1 (0x1)
+#define COMMUNICATION_PHASE_2 (0x2)
+#define COMMUNICATION_PHASE_3 (0x3)
+#define COMMUNICATION_PHASE_4 (0x4)
+
+void proto_register_sercosiii(void);
+void proto_reg_handoff_sercosiii(void);
+
+static dissector_handle_t siii_handle;
+
+/* Initialize the protocol and registered fields */
+static gint proto_siii = -1;
+
+/* Initialize the subtree pointers */
+static gint ett_siii = -1;
+static gint ett_siii_header = -1;
+static gint ett_siii_mst = -1;
+static gint ett_siii_mst_teltype = -1;
+static gint ett_siii_mst_phase = -1;
+static gint ett_siii_mdt = -1;
+static gint ett_siii_mdt_svc = -1;
+static gint ett_siii_mdt_devctrls = -1;
+static gint ett_siii_mdt_version = -1;
+static gint ett_siii_mdt_svc_channel = -1;
+static gint ett_siii_mdt_dev_control = -1;
+static gint ett_siii_mdt_devctrl = -1;
+static gint ett_siii_mdt_svcctrl = -1;
+static gint ett_siii_mdt_svcinfo = -1;
+static gint ett_siii_at_svcstat = -1;
+static gint ett_siii_at_svcinfo = -1;
+static gint ett_siii_mdt_svch_data_error_info = -1;
+static gint ett_siii_mdt_svch_data = -1;
+static gint ett_siii_at_devstatus = -1;
+static gint ett_siii_at_sercosaddress = -1;
+static gint ett_siii_at = -1;
+static gint ett_siii_at_svc = -1;
+static gint ett_siii_at_sercos_address = -1;
+static gint ett_siii_at_devstats = -1;
+static gint ett_siii_at_svc_channel = -1;
+static gint ett_siii_at_dev_status = -1;
+static gint ett_siii_mdt_hp = -1;
+static gint ett_siii_at_hp = -1;
+static gint ett_siii_mdt_hp_ctrl = -1;
+static gint ett_siii_mdt_hp_info = -1;
+static gint ett_siii_at_hp_stat = -1;
+static gint ett_siii_at_hp_info = -1;
+static gint ett_siii_recognized_devices = -1;
+
+static gint hf_siii_mdt_version = -1;
+static gint hf_siii_mdt_version_initprocvers = -1;
+static gint hf_siii_mdt_version_num_mdt_at_cp1_2 = -1;
+static gint hf_siii_mdt_version_switch_off_sercos_telegrams = -1;
+static gint hf_siii_mdt_version_fast_cp_switch = -1;
+static gint hf_siii_mdt_version_transmission_of_communication_parameters_mdt0_cp0 = -1;
+static gint hf_siii_mdt_dev_control_top_control = -1;
+static gint hf_siii_at_dev_control_ident = -1;
+static gint hf_siii_mdt_dev_control_change_topology = -1;
+static gint hf_siii_mdt_dev_control = -1;
+static gint hf_siii_mst_channel = -1;
+static gint hf_siii_mst_type = -1;
+static gint hf_siii_mst_cyclecntvalid = -1;
+static gint hf_siii_mst_telno = -1;
+static gint hf_siii_mst_phase = -1;
+static gint hf_siii_mst_cyclecnt = -1;
+static gint hf_siii_mst_crc32 = -1;
+static gint hf_siii_mdt_svch_dbe = -1;
+static gint hf_siii_mdt_svch_eot = -1;
+static gint hf_siii_mdt_svch_rw = -1;
+static gint hf_siii_mdt_svch_mhs = -1;
+static gint hf_siii_mdt_svch_info = -1;
+static gint hf_siii_at_svch_valid = -1;
+static gint hf_siii_at_svch_error = -1;
+static gint hf_siii_at_svch_busy = -1;
+static gint hf_siii_at_svch_ahs = -1;
+static gint hf_siii_at_svch_info = -1;
+static gint hf_siii_mdt_svch_idn = -1;
+static gint hf_siii_mdt_svch_ctrl = -1;
+static gint hf_siii_at_svch_stat = -1;
+/* static gint hf_siii_svch_data_telofs_telno = -1; */
+/* static gint hf_siii_svch_data_telofs_mdt_at = -1; */
+/* static gint hf_siii_svch_data_telofs_offset = -1; */
+/* static gint hf_siii_svch_data_proccmd_proccmdexec = -1; */
+/* static gint hf_siii_svch_data_proccmd_proccmd = -1; */
+static gint hf_siii_at_cp0_support_functions = -1;
+static gint hf_siii_at_cp0_device_address = -1;
+static gint hf_siii_at_dev_status = -1;
+static gint hf_siii_at_dev_status_commwarning = -1;
+static gint hf_siii_at_dev_status_change_topology = -1;
+static gint hf_siii_at_dev_status_top_status = -1;
+static gint hf_siii_at_dev_status_inactive_port_status = -1;
+static gint hf_siii_at_dev_status_errorconnection = -1;
+static gint hf_siii_at_dev_status_slave_valid = -1;
+static gint hf_siii_at_dev_status_proc_command_change = -1;
+static gint hf_siii_at_dev_status_parameterization_level_active = -1;
+static gint hf_siii_mdt_hotplug_address = -1;
+static gint hf_siii_mdt_hp_ctrl = -1;
+static gint hf_siii_mdt_hp_info = -1;
+static gint hf_siii_at_hotplug_address = -1;
+static gint hf_siii_at_hp_stat = -1;
+static gint hf_siii_at_hp_info = -1;
+static gint hf_siii_mdt_hotplug_control_param = -1;
+static gint hf_siii_mdt_hotplug_control_svc_switch = -1;
+static gint hf_siii_at_hotplug_status_param = -1;
+static gint hf_siii_at_hotplug_status_hp0_finished = -1;
+static gint hf_siii_at_hotplug_status_error = -1;
+static gint hf_siii_service_channels = -1;
+static gint hf_siii_device_controls = -1;
+static gint hf_siii_device_status = -1;
+static gint hf_siii_idn_code = -1;
+static gint hf_siii_at_cp0_num_devices = -1;
+static gint hf_siii_at_cp0_sercos_address = -1;
+
+static expert_field ei_siii_cp_unknown = EI_INIT;
+
+
+/* Allow heuristic dissection */
+static heur_dissector_list_t heur_subdissector_list;
+
+static const value_string siii_mdt_version_num_mdtat_cp1_2_text[]=
+{
+  {0x00, "2 MDTs/ATs in CP1/2"},
+  {0x01, "4 MDTs/ATs in CP1/2"},
+  {0, NULL}
+};
+
+static const true_false_string siii_mdt_version_fast_cp_switch_text = {
+  "Transmission of MST (MDT0) interrupted during CP switch for CPS delay time (120ms)",
+  "CPS delay time reduce to the re-configuration time of the master"
+};
+
+
+static const true_false_string siii_switch_off_sercos_telegram_text = {
+  "Industrial Ethernet devices not used by application",
+  "Industrial Ethernet devices used by application"
+};
+
+static const true_false_string siii_mdt_version_initprocvers_text = {
+  "No remote address allocation",
+  "Remote address allocation"
+};
+
+#if 0
+static const value_string siii_svch_data_proccmd_proccmdexec_text[]=
+{
+  {0, "Interrupt procedure command execution"},
+  {1, "Enable procedure command execution"},
+  {0, NULL}
+};
+
+static const value_string siii_svch_data_proccmd_proccmd_text[]=
+{
+  {0, "Cancel procedure command"},
+  {1, "Set procedure command"},
+  {0, NULL}
+};
+
+static const value_string siii_svch_data_mdt_at_text[]=
+{
+  {0, "AT-telegram"},
+  {1, "MDT-telegram"},
+  {0, NULL}
+};
+#endif
+
+#define IDN(SI, SE, type, paramset, datablock) ((SI<<24)|(SE<<16)|(type<<15)|(paramset<<12)|(datablock))
+
+static const value_string siii_mdt_idn_text[]=
+{
+  {IDN(0,0,0,0,   0), "Dummy-Parameter"},
+  {IDN(0,0,0,0,   1), "Control unit cycle time (tNcyc)"},
+  {IDN(0,0,0,0,   2), "Communication cycle time (tScyc)"},
+  {IDN(0,0,0,0,  11), "Class 1 diagnostic"},
+  {IDN(0,0,0,0,  12), "Class 2 diagnostic"},
+  {IDN(0,0,0,0,  14), "Interface status"},
+  {IDN(0,0,0,0,  15), "Telegram Type"},
+  {IDN(0,0,0,0,  16), "Configuration list of AT"},
+  {IDN(0,0,0,0,  17), "IDN-list of all operation data"},
+  {IDN(0,0,0,0,  18), "IDN-list of operation data for CP2"},
+  {IDN(0,0,0,0,  19), "IDN-list of operation data for CP3"},
+  {IDN(0,0,0,0,  21), "IDN-list of invalid operation data for CP2"},
+  {IDN(0,0,0,0,  22), "IDN-list of invalid operation data for CP3"},
+  {IDN(0,0,0,0,  24), "Configuration list of MDT"},
+  {IDN(0,0,0,0,  25), "IDN-list of all procedure commands"},
+  {IDN(0,0,0,0,  26), "Configuration list for signal status word"},
+  {IDN(0,0,0,0,  27), "Configuration list for signal control word"},
+  {IDN(0,0,0,0,  28), "MST error counter"},
+  {IDN(0,0,0,0,  29), "MDT error counter"},
+  {IDN(0,0,0,0,  32), "Primary operation mode"},
+  {IDN(0,0,0,0,  36), "Velocity command value"},
+  {IDN(0,0,0,0,  37), "Additive velocity command value"},
+  {IDN(0,0,0,0,  38), "Positive velocity limit value"},
+  {IDN(0,0,0,0,  39), "Negative velocity limit value"},
+  {IDN(0,0,0,0,  40), "Velocity feedback value 1"},
+  {IDN(0,0,0,0,  41), "Homing velocity"},
+  {IDN(0,0,0,0,  42), "Homing acceleration"},
+  {IDN(0,0,0,0,  43), "Velocity polarity parameter"},
+  {IDN(0,0,0,0,  44), "Velocity data scaling type"},
+  {IDN(0,0,0,0,  45), "Velocity data scaling factor"},
+  {IDN(0,0,0,0,  46), "Velocity data scaling exponent"},
+  {IDN(0,0,0,0,  47), "Position command value"},
+  {IDN(0,0,0,0,  48), "Additive position command value"},
+  {IDN(0,0,0,0,  49), "Positive position limit value"},
+  {IDN(0,0,0,0,  50), "Negative position limit value"},
+  {IDN(0,0,0,0,  51), "Position feedback value 1 (motor feedback)"},
+  {IDN(0,0,0,0,  52), "Reference distance 1"},
+  {IDN(0,0,0,0,  53), "Position feedback value 2 (external feedback)"},
+  {IDN(0,0,0,0,  54), "Reference distance 2"},
+  {IDN(0,0,0,0,  55), "Position polarity parameter"},
+  {IDN(0,0,0,0,  57), "Position window"},
+  {IDN(0,0,0,0,  58), "Reversal clearance"},
+  {IDN(0,0,0,0,  59), "Position switch flag parameter"},
+  {IDN(0,0,0,0,  60), "Position switches (position switch points on 1-16)"},
+  {IDN(0,0,0,0,  76), "Position data scaling type"},
+  {IDN(0,0,0,0,  77), "Linear position data scaling factor"},
+  {IDN(0,0,0,0,  78), "Linear position data scaling exponent"},
+  {IDN(0,0,0,0,  79), "Rotational position resolution"},
+  {IDN(0,0,0,0,  80), "Torque command value"},
+  {IDN(0,0,0,0,  81), "Additive torque command value"},
+  {IDN(0,0,0,0,  82), "Positive torque limit value"},
+  {IDN(0,0,0,0,  83), "Negative torque limit value"},
+  {IDN(0,0,0,0,  84), "Torque feedback value"},
+  {IDN(0,0,0,0,  85), "Torque polarity parameter"},
+  {IDN(0,0,0,0,  86), "Torque/force data scaling type"},
+  {IDN(0,0,0,0,  91), "Bipolar velocity limit value"},
+  {IDN(0,0,0,0,  92), "Bipolar torque limit value"},
+  {IDN(0,0,0,0,  93), "Torque/force scaling data factor"},
+  {IDN(0,0,0,0,  94), "Torque/force scaling data exponent"},
+  {IDN(0,0,0,0,  95), "Diagnostic message"},
+  {IDN(0,0,0,0,  96), "Slave arrangement (SLKN)"},
+  {IDN(0,0,0,0,  97), "Mask class 2 diagnostic"},
+  {IDN(0,0,0,0,  98), "Mask class 3 diagnostic"},
+  {IDN(0,0,0,0,  99), "Reset class 1 diagnostic"},
+  {IDN(0,0,0,0, 100), "Velocity loop proportional gain"},
+  {IDN(0,0,0,0, 101), "Velocity loop integral action time"},
+  {IDN(0,0,0,0, 102), "Velocity loop differential time"},
+  {IDN(0,0,0,0, 103), "Modulo value"},
+  {IDN(0,0,0,0, 104), "Position loop KV-factor"},
+  {IDN(0,0,0,0, 105), "Position loop integral action time"},
+  {IDN(0,0,0,0, 106), "Current loop proportional gain 1"},
+  {IDN(0,0,0,0, 107), "Current loop integral action time 1"},
+  {IDN(0,0,0,0, 108), "Feedrate override"},
+  {IDN(0,0,0,0, 109), "Motor peak current"},
+  {IDN(0,0,0,0, 110), "Amplifier peak current"},
+  {IDN(0,0,0,0, 111), "Motor continuous stall current"},
+  {IDN(0,0,0,0, 112), "Amplifier rated current"},
+  {IDN(0,0,0,0, 113), "Maximum motor speed"},
+  {IDN(0,0,0,0, 114), "Load limit of the motor"},
+  {IDN(0,0,0,0, 115), "Position feedback 2 type"},
+  {IDN(0,0,0,0, 116), "Resolution of feedback 1"},
+  {IDN(0,0,0,0, 117), "Resolution of feedback 2"},
+  {IDN(0,0,0,0, 118), "Resolution of linear feedback"},
+  {IDN(0,0,0,0, 119), "Current loop proportional gain 2"},
+  {IDN(0,0,0,0, 120), "Current loop integral action time 2"},
+  {IDN(0,0,0,0, 121), "Input revolutions of load gear"},
+  {IDN(0,0,0,0, 122), "Output revolutions of load gear"},
+  {IDN(0,0,0,0, 123), "Feed constant"},
+  {IDN(0,0,0,0, 124), "Standstill window"},
+  {IDN(0,0,0,0, 125), "Velocity threshold (nx)"},
+  {IDN(0,0,0,0, 126), "Torque threshold (Tx)"},
+  {IDN(0,0,0,0, 127), "CP3 transition check"},
+  {IDN(0,0,0,0, 128), "CP4 transition check"},
+  {IDN(0,0,0,0, 129), "Manufacturer class 1 diagnostic"},
+  {IDN(0,0,0,0, 130), "Probe value 1 positive edge"},
+  {IDN(0,0,0,0, 131), "Probe value 1 negative edge"},
+  {IDN(0,0,0,0, 132), "Probe value 2 positive edge"},
+  {IDN(0,0,0,0, 133), "Probe value 2 negative edge"},
+  {IDN(0,0,0,0, 134), "Drive control"},
+  {IDN(0,0,0,0, 135), "Drive status"},
+  {IDN(0,0,0,0, 136), "Positive acceleration limit value"},
+  {IDN(0,0,0,0, 137), "Negative acceleration limit value"},
+  {IDN(0,0,0,0, 138), "Bipolar acceleration limit value"},
+  {IDN(0,0,0,0, 139), "Park axis procedure command"},
+  {IDN(0,0,0,0, 143), "SERCOS Interface version"},
+  {IDN(0,0,0,0, 144), "Signal status word"},
+  {IDN(0,0,0,0, 145), "Signal control word"},
+  {IDN(0,0,0,0, 146), "Control unit controlled homing procedure command"},
+  {IDN(0,0,0,0, 147), "Homing parameter"},
+  {IDN(0,0,0,0, 148), "Drive controlled homing procedure command"},
+  {IDN(0,0,0,0, 149), "Position drive stop procedure command"},
+  {IDN(0,0,0,0, 150), "Reference offset 1"},
+  {IDN(0,0,0,0, 151), "Reference offset 2"},
+  {IDN(0,0,0,0, 152), "Position spindle procedure command"},
+  {IDN(0,0,0,0, 153), "Spindle angle position"},
+  {IDN(0,0,0,0, 154), "Spindle positioning parameter"},
+  {IDN(0,0,0,0, 155), "Friction torque compensation"},
+  {IDN(0,0,0,0, 156), "Velocity feedback value 2"},
+  {IDN(0,0,0,0, 157), "Velocity window"},
+  {IDN(0,0,0,0, 158), "Power threshold (Px)"},
+  {IDN(0,0,0,0, 159), "Monitoring window"},
+  {IDN(0,0,0,0, 161), "Acceleration data scaling factor"},
+  {IDN(0,0,0,0, 162), "Acceleration data scaling exponent"},
+  {IDN(0,0,0,0, 163), "Weight counterbalance"},
+  {IDN(0,0,0,0, 164), "Acceleration feedback value 1"},
+  {IDN(0,0,0,0, 165), "Distance-coded reference marks A"},
+  {IDN(0,0,0,0, 166), "Distance-coded reference marks B"},
+  {IDN(0,0,0,0, 167), "Frequency limit of feedback 1"},
+  {IDN(0,0,0,0, 169), "Probe control"},
+  {IDN(0,0,0,0, 170), "Probing cycle procedure command"},
+  {IDN(0,0,0,0, 171), "Calculate displacement procedure command"},
+  {IDN(0,0,0,0, 172), "Displacement to the referenced system procedure command"},
+  {IDN(0,0,0,0, 173), "Marker position A"},
+  {IDN(0,0,0,0, 174), "Marker position B"},
+  {IDN(0,0,0,0, 175), "Displacement parameter 1"},
+  {IDN(0,0,0,0, 176), "Displacement parameter 2"},
+  {IDN(0,0,0,0, 177), "Absolute distance 1"},
+  {IDN(0,0,0,0, 178), "Absolute distance 2"},
+  {IDN(0,0,0,0, 179), "Probe status"},
+  {IDN(0,0,0,0, 180), "Spindle relative offset"},
+  {IDN(0,0,0,0, 181), "Manufacturer class 2 diagnostic"},
+  {IDN(0,0,0,0, 183), "Synchronization velocity window"},
+  {IDN(0,0,0,0, 184), "Synchronization velocity error limit"},
+  {IDN(0,0,0,0, 185), "Length of the configurable data record in the AT"},
+  {IDN(0,0,0,0, 186), "Length of the configurable data record in the MDT"},
+  {IDN(0,0,0,0, 187), "IDN list of configurable data in the AT"},
+  {IDN(0,0,0,0, 188), "IDN list of configurable data in the MDT"},
+  {IDN(0,0,0,0, 189), "Following distance"},
+  {IDN(0,0,0,0, 190), "Drive controlled gear engaging procedure command"},
+  {IDN(0,0,0,0, 191), "Cancel reference point procedure command"},
+  {IDN(0,0,0,0, 192), "IDN-list of all backup operation data"},
+  {IDN(0,0,0,0, 193), "Positioning jerk"},
+  {IDN(0,0,0,0, 194), "Acceleration command time"},
+  {IDN(0,0,0,0, 195), "Acceleration feedback value 2"},
+  {IDN(0,0,0,0, 196), "Motor rated current"},
+  {IDN(0,0,0,0, 197), "Set coordinate system procedure command"},
+  {IDN(0,0,0,0, 198), "Initial coordinate value"},
+  {IDN(0,0,0,0, 199), "Shift coordinate system procedure command"},
+  {IDN(0,0,0,0, 200), "Amplifier warning temperature"},
+  {IDN(0,0,0,0, 201), "Motor warning temperature"},
+  {IDN(0,0,0,0, 202), "Cooling error warning temperature"},
+  {IDN(0,0,0,0, 203), "Amplifier shut-down temperature"},
+  {IDN(0,0,0,0, 204), "Motor shut-down temperature"},
+  {IDN(0,0,0,0, 205), "Cooling error shut-down temperature"},
+  {IDN(0,0,0,0, 206), "Drive on delay time"},
+  {IDN(0,0,0,0, 207), "Drive off delay time"},
+  {IDN(0,0,0,0, 208), "Temperature data scaling type"},
+  {IDN(0,0,0,0, 209), "Lower adaptation limit"},
+  {IDN(0,0,0,0, 210), "Upper adaptation limit"},
+  {IDN(0,0,0,0, 211), "Adaptation proportional gain"},
+  {IDN(0,0,0,0, 212), "Adaptation integral action time"},
+  {IDN(0,0,0,0, 213), "Engaging dither amplitude"},
+  {IDN(0,0,0,0, 214), "Average engaging speed"},
+  {IDN(0,0,0,0, 215), "Engaging dither period"},
+  {IDN(0,0,0,0, 216), "Switch parameter set procedure command"},
+  {IDN(0,0,0,0, 217), "Parameter set preselection"},
+  {IDN(0,0,0,0, 218), "Gear-ration preselection"},
+  {IDN(0,0,0,0, 219), "IDN-list of parameter set"},
+  {IDN(0,0,0,0, 220), "Minimum spindle speed"},
+  {IDN(0,0,0,0, 221), "Maximum spindle speed"},
+  {IDN(0,0,0,0, 222), "Spindle positioning speed"},
+  {IDN(0,0,0,0, 223), "Drive controlled synchronous operation procedure command"},
+  {IDN(0,0,0,0, 224), "Lead Spindle Address"},
+  {IDN(0,0,0,0, 225), "Synchronous spindle revolutions"},
+  {IDN(0,0,0,0, 226), "Lead spindle revolutions"},
+  {IDN(0,0,0,0, 227), "Synchronous spindle revolutions"},
+  {IDN(0,0,0,0, 228), "Synchronization position window"},
+  {IDN(0,0,0,0, 229), "Synchronization position error limit"},
+  {IDN(0,0,0,0, 230), "Synchronization position offset"},
+  {IDN(0,0,0,0, 254), "Actual parameter set"},
+  {IDN(0,0,0,0, 255), "Actual gear ration"},
+  {IDN(0,0,0,0, 256), "Multiplication factor 1"},
+  {IDN(0,0,0,0, 257), "Multiplication factor 2"},
+  {IDN(0,0,0,0, 258), "Target position"},
+  {IDN(0,0,0,0, 259), "Positioning velocity"},
+  {IDN(0,0,0,0, 260), "Positioning acceleration"},
+  {IDN(0,0,0,0, 261), "Coarse position window"},
+  {IDN(0,0,0,0, 262), "Load defaults procedure command"},
+  {IDN(0,0,0,0, 263), "Load working memory procedure command"},
+  {IDN(0,0,0,0, 264), "Backup working memory procedure command"},
+  {IDN(0,0,0,0, 265), "Language selection"},
+  {IDN(0,0,0,0, 266), "List of available languages"},
+  {IDN(0,0,0,0, 267), "Password"},
+  {IDN(0,0,0,0, 268), "Angular setting"},
+  {IDN(0,0,0,0, 269), "Storage mode"},
+  {IDN(0,0,0,0, 270), "IDN-list of selected backup operation data"},
+  {IDN(0,0,0,0, 272), "Velocity window percentage"},
+  {IDN(0,0,0,0, 273), "Maximum drive off delay time"},
+  {IDN(0,0,0,0, 275), "Coordinate offset value"},
+  {IDN(0,0,0,0, 276), "Return to Modulo range procedure command"},
+  {IDN(0,0,0,0, 277), "Position feedback 1 type"},
+  {IDN(0,0,0,0, 278), "Maximum travel range"},
+  {IDN(0,0,0,0, 279), "IDN list of password protected data"},
+  {IDN(0,0,0,0, 280), "Underflow threshold"},
+  {IDN(0,0,0,0, 282), "Positioning command value"},
+  {IDN(0,0,0,0, 283), "Current coordinate offset"},
+  {IDN(0,0,0,0, 292), "List of supported operation modes"},
+  {IDN(0,0,0,0, 293), "Selectively backup working memory procedure command"},
+  {IDN(0,0,0,0, 294), "Divider modulo value"},
+  {IDN(0,0,0,0, 295), "Drive enable delay time"},
+  {IDN(0,0,0,0, 296), "Velocity feed forward gain"},
+  {IDN(0,0,0,0, 297), "Homing distance"},
+  {IDN(0,0,0,0, 298), "Suggest home switch distance"},
+  {IDN(0,0,0,0, 299), "Home switch offset 1"},
+  {IDN(0,0,0,0, 300), "Real-time control bit 1"},
+  {IDN(0,0,0,0, 301), "Allocation of real-time control bit 1",},
+  {IDN(0,0,0,0, 302), "Real-time control bit 2"},
+  {IDN(0,0,0,0, 303), "Allocation of real-time control bit 2"},
+  {IDN(0,0,0,0, 304), "Real-time status bit 1"},
+  {IDN(0,0,0,0, 305), "Allocation of real-time status bit 1"},
+  {IDN(0,0,0,0, 306), "Real-time status-bit 2"},
+  {IDN(0,0,0,0, 307), "Allocation of real-time status bit 2"},
+  {IDN(0,0,0,0, 308), "Synchronization operation status"},
+  {IDN(0,0,0,0, 309), "Synchronization error status"},
+  {IDN(0,0,0,0, 310), "Overload warning"},
+  {IDN(0,0,0,0, 311), "Amplifier overtemperature warning"},
+  {IDN(0,0,0,0, 312), "Motor overtemperature warning"},
+  {IDN(0,0,0,0, 313), "Cooling error warning"},
+  {IDN(0,0,0,0, 315), "Positioning velocity higher than n Limit"},
+  {IDN(0,0,0,0, 323), "Target position outside of travel range"},
+  {IDN(0,0,0,0, 326), "Parameter checksum"},
+  {IDN(0,0,0,0, 327), "IDN list of checksum parameter"},
+  {IDN(0,0,0,0, 328), "Bit number allocation list for signal status word"},
+  {IDN(0,0,0,0, 329), "Bit number allocation list for signal control word"},
+  {IDN(0,0,0,0, 330), "Status 'nfeedback = ncommand'"},
+  {IDN(0,0,0,0, 331), "Status 'nfeedback = 0'"},
+  {IDN(0,0,0,0, 332), "Status 'nfeedback less then nx'"},
+  {IDN(0,0,0,0, 333), "Status 'T higher than Tx'"},
+  {IDN(0,0,0,0, 334), "Status 'T greater than Tlimit '"},
+  {IDN(0,0,0,0, 335), "Status 'ncommand greater than nlimit'"},
+  {IDN(0,0,0,0, 336), "Status 'In position'"},
+  {IDN(0,0,0,0, 337), "Status 'P greater Px'"},
+  {IDN(0,0,0,0, 338), "Status 'Position feedback = active target position'"},
+  {IDN(0,0,0,0, 339), "Status 'nfeedback less than minimum spindle speed'"},
+  {IDN(0,0,0,0, 340), "Status 'nfeedback exceeds maximum spindle speed'"},
+  {IDN(0,0,0,0, 341), "Status 'In Coarse position'"},
+  {IDN(0,0,0,0, 342), "Status 'Target position attained'"},
+  {IDN(0,0,0,0, 343), "Status 'Interpolator halted'"},
+  {IDN(0,0,0,0, 346), "Positioning control"},
+  {IDN(0,0,0,0, 347), "Velocity error"},
+  {IDN(0,0,0,0, 348), "Acceleration feed forward gain"},
+  {IDN(0,0,0,0, 349), "Bipolar jerk limit"},
+  {IDN(0,0,0,0, 356), "Distance home switch - marker puls"},
+  {IDN(0,0,0,0, 357), "Marker pulse distance"},
+  {IDN(0,0,0,0, 358), "Home switch offset 2"},
+  {IDN(0,0,0,0, 359), "Positioning deceleration"},
+  {IDN(0,0,0,0, 360), "MDT data container"},
+  {IDN(0,0,0,0, 362), "MDT data container A list index"},
+  {IDN(0,0,0,0, 364), "AT data container A1"},
+  {IDN(0,0,0,0, 366), "AT data container A list index"},
+  {IDN(0,0,0,0, 368), "Data container A pointer"},
+  {IDN(0,0,0,0, 370), "MDT data container A/B configuration list"},
+  {IDN(0,0,0,0, 371), "AT data container A/B configuration list"},
+  {IDN(0,0,0,0, 372), "Drive Halt acceleration bipolar"},
+  {IDN(0,0,0,0, 377), "Velocity feedback monitoring window"},
+  {IDN(0,0,0,0, 378), "Absolute encoder range 1"},
+  {IDN(0,0,0,0, 379), "Absolute encoder range 2"},
+  {IDN(0,0,0,0, 380), "DC bus voltage"},
+  {IDN(0,0,0,0, 381), "DC bus current"},
+  {IDN(0,0,0,0, 382), "DC bus power"},
+  {IDN(0,0,0,0, 383), "Motor temperature"},
+  {IDN(0,0,0,0, 384), "Amplifier temperature"},
+  {IDN(0,0,0,0, 385), "Active power"},
+  {IDN(0,0,0,0, 386), "Active position feedback value"},
+  {IDN(0,0,0,0, 387), "Power overload"},
+  {IDN(0,0,0,0, 388), "Braking current limit"},
+  {IDN(0,0,0,0, 389), "Effective current"},
+  {IDN(0,0,0,0, 390), "DiagnosticNumber"},
+  {IDN(0,0,0,0, 391), "Position feedback monitoring window"},
+  {IDN(0,0,0,0, 392), "Velocity feedback filter"},
+  {IDN(0,0,0,0, 393), "Command value mode"},
+  {IDN(0,0,0,0, 398), "IDN list of configurable real-time/status bits"},
+  {IDN(0,0,0,0, 399), "IDN list of configurable real-time/control bits"},
+  {IDN(0,0,0,0, 400), "Home switch"},
+  {IDN(0,0,0,0, 401), "Probe 1"},
+  {IDN(0,0,0,0, 402), "Probe 2"},
+  {IDN(0,0,0,0, 403), "Position feedback value status"},
+  {IDN(0,0,0,0, 404), "Position command value status"},
+  {IDN(0,0,0,0, 405), "Probe 1 enable"},
+  {IDN(0,0,0,0, 406), "Probe 2 enable"},
+  {IDN(0,0,0,0, 407), "Homing enable"},
+  {IDN(0,0,0,0, 408), "Reference marker pulse registered"},
+  {IDN(0,0,0,0, 409), "Probe 1 positive latched"},
+  {IDN(0,0,0,0, 410), "Probe 1 negative latched"},
+  {IDN(0,0,0,0, 411), "Probe 2 positive latched"},
+  {IDN(0,0,0,0, 412), "Probe 2 negative latched"},
+  {IDN(0,0,0,0, 413), "Bit number allocation of real-time control bit 1"},
+  {IDN(0,0,0,0, 414), "Bit number allocation of real-time control bit 2"},
+  {IDN(0,0,0,0, 415), "Bit number allocation of real-time status bit 1"},
+  {IDN(0,0,0,0, 416), "Bit number allocation of real-time status bit 2"},
+  {IDN(0,0,0,0, 417), "Positioning velocity threshold in modulo mode"},
+  {IDN(0,0,0,0, 418), "Target position window in modulo mode"},
+  {IDN(0,0,0,0, 419), "Positioning acknowledge"},
+  {IDN(0,0,0,0, 420), "Activate parameterization level procedure command (PL)"},
+  {IDN(0,0,0,0, 422), "Exit parameterization level procedure command"},
+  {IDN(0,0,0,0, 423), "IDN-list of invalid data for parameterization level"},
+  {IDN(0,0,0,0, 426), "Measuring data allocation 1"},
+  {IDN(0,0,0,0, 427), "Measuring data allocation 2"},
+  {IDN(0,0,0,0, 428), "IDN list of configurable measuring data"},
+  {IDN(0,0,0,0, 429), "Emergency stop deceleration"},
+  {IDN(0,0,0,0, 430), "Active target position"},
+  {IDN(0,0,0,0, 431), "Spindle positioning acceleration bipolar"},
+  {IDN(0,0,0,0, 437), "Positioning status"},
+  {IDN(0,0,0,0, 446), "Ramp reference velocity"},
+  {IDN(0,0,0,0, 447), "Set absolute position procedure command"},
+  {IDN(0,0,0,0, 448), "Set absolute position control word"},
+  {IDN(0,0,0,0, 460), "Position switches (position switch points off 1-16)"},
+  {IDN(0,0,0,0, 476), "Position switch control"},
+  {IDN(0,0,0,0, 477), "Position switch hysteresis"},
+  {IDN(0,0,0,0, 478), "Limit switch status"},
+  {IDN(0,0,0,0, 509), "Extended probe control"},
+  {IDN(0,0,0,0, 510), "Difference value probe 1"},
+  {IDN(0,0,0,0, 511), "Difference value probe 2"},
+  {IDN(0,0,0,0, 512), "Start position probing window 1"},
+  {IDN(0,0,0,0, 513), "End position probing window 1"},
+  {IDN(0,0,0,0, 514), "Start position probing window 2"},
+  {IDN(0,0,0,0, 515), "End position probing window 2"},
+  {IDN(0,0,0,0, 516), "Marker losses probe 1"},
+  {IDN(0,0,0,0, 517), "Marker losses probe 2"},
+  {IDN(0,0,0,0, 518), "Maximum marker losses probe 1"},
+  {IDN(0,0,0,0, 519), "Maximum marker losses probe 2"},
+  {IDN(0,0,0,0, 520), "Axis control word"},
+  {IDN(0,0,0,0, 521), "Axis status word"},
+  {IDN(0,0,0,0, 522), "Difference value 1 latched"},
+  {IDN(0,0,0,0, 523), "Difference value 2 latched"},
+  {IDN(0,0,0,0, 524), "Probe 1 delay positive"},
+  {IDN(0,0,0,0, 525), "Delay Negative Edge, Probe 1"},
+  {IDN(0,0,0,0, 526), "Delay positive Edge, Probe 2"},
+  {IDN(0,0,0,0, 527), "Delay Negative Edge, Probe 2"},
+  {IDN(0,0,0,0, 530), "Clamping torque"},
+  {IDN(0,0,0,0, 531), "Checksum for backup operation data"},
+  {IDN(0,0,0,0, 532), "Limit switch control"},
+  {IDN(0,0,0,0, 533), "Motor continuous stall torque/force"},
+  {IDN(0,0,0,0,1000), "SCP Type & Version"},
+  {IDN(0,0,0,0,1001), "SERCOS III: Control unit cycle time (tNcyc)"},
+  {IDN(0,0,0,0,1002), "SERCOS III: Communication cycle time (tScyc)"},
+  {IDN(0,0,0,0,1003), "SERCOS III: Number of successive MDT errors"},
+  {IDN(0,0,0,0,1005), "SERCOS III: Feedback value computation time (t5)"},
+  {IDN(0,0,0,0,1006), "SERCOS III: AT transmission starting time (t1)"},
+  {IDN(0,0,0,0,1007), "SERCOS III: Synchronization time (t8)"},
+  {IDN(0,0,0,0,1008), "SERCOS III: Command value valid time (t3)"},
+  {IDN(0,0,0,0,1009), "SERCOS III: Device Control offset in MDT"},
+  {IDN(0,0,0,0,1010), "SERCOS III: Length of MDT"},
+  {IDN(0,0,0,0,1011), "SERCOS III: Device Status offset in AT"},
+  {IDN(0,0,0,0,1012), "SERCOS III: Length of AT"},
+  {IDN(0,0,0,0,1013), "SERCOS III: SVC offset in MDT"},
+  {IDN(0,0,0,0,1014), "SERCOS III: SVC offset in AT"},
+  {IDN(0,0,0,0,1015), "SERCOS III: Ring delay"},
+  {IDN(0,0,0,0,1016), "SERCOS III: Slave delay"},
+  {IDN(0,0,0,0,1017), "SERCOS III: Transmission starting time IP channel"},
+  {IDN(0,0,0,0,1018), "SERCOS III: SYNC delay"},
+  {IDN(0,0,0,0,1019), "SERCOS III: MAC address"},
+  {IDN(0,0,0,0,1020), "SERCOS III: IP address"},
+  {IDN(0,0,0,0,1021), "SERCOS III: Network mask"},
+  {IDN(0,0,0,0,1022), "SERCOS III: Gateway address"},
+  {IDN(0,0,0,0,1023), "SERCOS III: Sync jitter"},
+  {IDN(0,0,0,0,1024), "SERCOS III: Ring control - node control"},
+  {IDN(0,0,0,0,1025), "SERCOS III: Ring status - node status"},
+  {IDN(0,0,0,0,1026), "SERCOS III: Hardware identification"},
+  {IDN(0,0,0,0,1028), "SERCOS III: Error counter MDT0 MST"},
+  {IDN(0,0,0,0,1029), "SERCOS III: Error counter MDT0-3"},
+  {IDN(0,0,0,0,1030), "SERCOS III: Error counter AT0-3"},
+  {IDN(0,0,0,0,1031), "Signal assignment Port 1 & Port 2"},
+  {IDN(0,0,0,0,1035), "Error counter Port1 and Port2"},
+  {IDN(0,0,0,0,1040), "SERCOSAddress"},
+  {IDN(0,0,0,0,1041), "AT Command value valid time (t9)"},
+  {IDN(0,0,0,0,1044), "Device Control"},
+  {IDN(0,0,0,0,1045), "Device Status"},
+  {IDN(0,0,0,0,1046), "IDN-list of SERCOS addresses in device"},
+  {IDN(0,0,0,0,1134), "SERCOS III: Device control"},
+  {IDN(0,0,0,0,1135), "SERCOS III: Device status"},
+  {IDN(1,0,0,0,1027), "Requested MTU"},
+  {IDN(2,0,0,0,1027), "Effective MTU"},
+  {0, NULL}
+};
+static value_string_ext siii_mdt_idn_text_ext = VALUE_STRING_EXT_INIT(siii_mdt_idn_text);
+
+static const value_string siii_mdt_svch_dbe_text[]=
+{
+  {0x00, "Element 0: Closed SVC"},
+  {0x01, "Element 1: Opening IDN"},
+  {0x02, "Element 2: Name of operation data"},
+  {0x03, "Element 3: Attribute of operation data"},
+  {0x04, "Element 4: Unit of operation data"},
+  {0x05, "Element 5: Minimum value of operation data"},
+  {0x06, "Element 6: Maximum value of operation data"},
+  {0x07, "Element 7: Operation data"},
+  {0, NULL}
+};
+
+static const true_false_string siii_mdt_svch_eot_text = {
+  "Transmission in progress",
+  "Last transmission"
+};
+
+static const true_false_string siii_mdt_svch_rw_text = {
+  "Read SVC INFO",
+  "Write SVC INFO"
+};
+
+static const value_string siii_mdt_devcontrol_topcontrol_text[]=
+{
+  {0x00, "Fast Forward on P/S-Channel"},
+  {0x01, "Loopback on P-Channel and Fast Forward"},
+  {0x02, "Loopback on S-Channel and Fast Forward"},
+  {0, NULL}
+};
+
+static const true_false_string siii_at_svch_error_text = {
+  "No error",
+  "Error in SVC"
+};
+
+static const true_false_string siii_at_svch_busy_text = {
+  "Step finished, slave ready for new step",
+  "Step in process, new step not allowed"
+};
+
+
+static const value_string siii_mst_phase_text[]=
+{
+  {0x00, "CP0"},
+  {0x01, "CP1"},
+  {0x02, "CP2"},
+  {0x03, "CP3"},
+  {0x04, "CP4"},
+  {0x80, "CP0 (Phase Change)"},
+  {0x81, "CP1 (Phase Change)"},
+  {0x82, "CP2 (Phase Change)"},
+  {0x83, "CP3 (Phase Change)"},
+  {0x84, "CP4 (Phase Change)"},
+  {0, NULL}
+};
+
+#if 0
+static const value_string siii_mst_teltype_text[]=
+{
+  {0x00, "CP0"},
+  {0x01, "CP1"},
+  {0x02, "CP2"},
+  {0x03, "CP3"},
+  {0x04, "CP4"},
+  {0x80, "CP0 (Phase Change)"},
+  {0x81, "CP1 (Phase Change)"},
+  {0x82, "CP2 (Phase Change)"},
+  {0x83, "CP3 (Phase Change)"},
+  {0x84, "CP4 (Phase Change)"},
+  {0, NULL}
+};
+#endif
+
+static const value_string siii_mst_channel_text[]=
+{
+  {0x00, "P-Telegram"},
+  {0x01, "S-Telegram"},
+  {0, NULL}
+};
+
+static const value_string siii_mst_type_text[]=
+{
+  {0x00, "MDT"},
+  {0x01, "AT"},
+  {0, NULL}
+};
+
+static const value_string siii_at_devstatus_errorconnection_text[]=
+{
+  {0x00, "Error-free connection"},
+  {0x01, "Error in the connection occurs"},
+  {0, NULL}
+};
+
+static const value_string siii_at_devstatus_topstatus_text[]=
+{
+  {0x00, "Fast Forward on P/S-Channel"},
+  {0x01, "Loopback on P-Channel and Fast Forward"},
+  {0x02, "Loopback on S-Channel and Fast Forward"},
+  {0, NULL}
+};
+
+static const true_false_string siii_at_cp0_support_functions_text = {
+  "Slave doesn't support one or more of the requested functions",
+  "Slave supports all requested functions"
+};
+
+static const value_string siii_at_devstatus_inactiveportstatus_text[]=
+{
+  {0x00, "No link on port"},
+  {0x01, "Link on port"},
+  {0x02, "S III P-Telegram on port"},
+  {0x03, "S III S-Telegram on port"},
+  {0, NULL}
+};
+
+static const value_string siii_at_dev_status_proc_command_change_text[]=
+{
+  {0x00, "No change in procedure command acknowledgement"},
+  {0x01, "Changing procedure command acknowledgement"},
+  {0, NULL}
+};
+
+
+static const value_string siii_mdt_hotplug_control_functioncode_text[]=
+{
+  {0x00, "No data"},
+  {0x01, "tScyc"},
+  {0x02, "t1"},
+  {0x03, "t6"},
+  {0x04, "t7"},
+  {0x05, "Communication Version"},
+  {0x06, "Communication timeout"},
+  {0x10, "MDT0 Length"},
+  {0x11, "MDT1 Length"},
+  {0x12, "MDT2 Length"},
+  {0x13, "MDT3 Length"},
+  {0x20, "AT0 Length"},
+  {0x21, "AT1 Length"},
+  {0x22, "AT2 Length"},
+  {0x23, "AT3 Length"},
+  {0x80, "MDT-SVC pointer"},
+  {0x81, "MDT-RTD pointer"},
+  {0x82, "AT-SVC pointer"},
+  {0x83, "AT-RTD pointer"},
+  {0, NULL}
+};
+static value_string_ext siii_mdt_hotplug_control_functioncode_text_ext =
+    VALUE_STRING_EXT_INIT(siii_mdt_hotplug_control_functioncode_text);
+
+static const value_string siii_mdt_hotplug_control_svc_switch_text[]=
+{
+  {0, "Transmission via HP-field"},
+  {1, "Switch to SVC"},
+  {0, NULL}
+};
+
+static const value_string siii_mdt_hotplug_status_ackcode_text[]=
+{
+  {0x80, "MDT-SVC pointer"},
+  {0x81, "MDT-RTD pointer"},
+  {0x82, "AT-SVC pointer"},
+  {0x83, "AT-RTD pointer"},
+  {255, "Next Sercos Slave has same address"},
+  {0, NULL}
+};
+
+static const value_string siii_at_hotplug_status_error_text[]=
+{
+  {0, "Acknowledgement in HP-1"},
+  {1, "Error in HP-1"},
+  {0, NULL}
+};
+
+
+
+
+
+static void dissect_siii_mst(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+  proto_tree *subtree;
+  proto_tree *subtree2;
+
+  subtree = proto_tree_add_subtree(tree, tvb, 0, 6, ett_siii_mst, NULL, "MST");
+
+  subtree2 = proto_tree_add_subtree(subtree, tvb, 0, 1, ett_siii_mst_teltype, NULL, "Telegram Type");
+
+  proto_tree_add_item(subtree2, hf_siii_mst_channel,       tvb, 0, 1, ENC_LITTLE_ENDIAN);
+  proto_tree_add_item(subtree2, hf_siii_mst_type,          tvb, 0, 1, ENC_LITTLE_ENDIAN);
+  proto_tree_add_item(subtree2, hf_siii_mst_cyclecntvalid, tvb, 0, 1, ENC_LITTLE_ENDIAN);
+  proto_tree_add_item(subtree2, hf_siii_mst_telno,         tvb, 0, 1, ENC_LITTLE_ENDIAN);
+
+  subtree2 = proto_tree_add_subtree(subtree, tvb, 1, 1, ett_siii_mst_phase, NULL, "Phase Field");
+
+  proto_tree_add_item(subtree2, hf_siii_mst_phase,    tvb, 1, 1, ENC_LITTLE_ENDIAN);
+  proto_tree_add_item(subtree2, hf_siii_mst_cyclecnt, tvb, 1, 1, ENC_LITTLE_ENDIAN);
+  proto_tree_add_item(subtree, hf_siii_mst_crc32,     tvb, 2, 4, ENC_LITTLE_ENDIAN);
+
+}
+
+static void dissect_siii_mdt_hp(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+  proto_tree *subtree;
+
+  static int * const ctrl_fields[] = {
+    &hf_siii_mdt_hotplug_control_svc_switch,
+    &hf_siii_mdt_hotplug_control_param,
+    NULL
+  };
+
+  subtree = proto_tree_add_subtree(tree, tvb, 0, 8, ett_siii_mdt_hp, NULL, "Hot-Plug");
+
+  proto_tree_add_item(subtree, hf_siii_mdt_hotplug_address, tvb, 0, 2, ENC_LITTLE_ENDIAN);
+
+  proto_tree_add_bitmask(subtree, tvb, 2, hf_siii_mdt_hp_ctrl,
+                                   ett_siii_mdt_hp_ctrl, ctrl_fields, ENC_LITTLE_ENDIAN);
+
+  proto_tree_add_item(subtree, hf_siii_mdt_hp_info, tvb, 4, 4, ENC_NA);
+}
+
+static void dissect_siii_mdt_devctrl(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+  static int * const ctrl_fields[] = {
+    &hf_siii_at_dev_control_ident,
+    &hf_siii_mdt_dev_control_change_topology,
+    &hf_siii_mdt_dev_control_top_control,
+    NULL
+  };
+
+  proto_tree_add_bitmask(tree, tvb, 0, hf_siii_mdt_dev_control,
+                                   ett_siii_mdt_devctrl, ctrl_fields, ENC_LITTLE_ENDIAN);
+}
+
+static void dissect_siii_mdt_svc(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, guint devno _U_) /* devno will be needed in later versions */
+{
+  proto_tree *subtree;
+  proto_item *ti;
+
+  static int * const svch_fields[] = {
+    &hf_siii_mdt_svch_dbe, /* data block element */
+    &hf_siii_mdt_svch_eot, /* end of transmission */
+    &hf_siii_mdt_svch_rw,  /* read or write */
+    &hf_siii_mdt_svch_mhs, /* master hand shake */
+    NULL
+  };
+
+  guint16 svc_ctrl = tvb_get_letohs(tvb, 0); /* service channel header */
+  guint8  svc_dbe  = (svc_ctrl>>3) & 7;      /* accessed data block element */
+
+  proto_tree_add_bitmask(tree, tvb, 0, hf_siii_mdt_svch_ctrl,
+                                   ett_siii_mdt_svcctrl, svch_fields, ENC_LITTLE_ENDIAN);
+
+  ti = proto_tree_add_item(tree, hf_siii_mdt_svch_info, tvb, 2, 4, ENC_NA);
+
+  if (1 == svc_dbe)
+  {
+    subtree = proto_item_add_subtree(ti, ett_siii_mdt_svcinfo);
+    proto_tree_add_item(subtree, hf_siii_idn_code, tvb, 2, 4, ENC_LITTLE_ENDIAN);
+    proto_tree_add_item(subtree, hf_siii_mdt_svch_idn, tvb, 2, 4, ENC_LITTLE_ENDIAN);
+  }
+}
+
+static void dissect_siii_mdt_cp0(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+  static int * const version_fields[] = {
+    &hf_siii_mdt_version_switch_off_sercos_telegrams,
+    &hf_siii_mdt_version_fast_cp_switch,
+    &hf_siii_mdt_version_transmission_of_communication_parameters_mdt0_cp0,
+    &hf_siii_mdt_version_num_mdt_at_cp1_2,
+    &hf_siii_mdt_version_initprocvers,
+    NULL
+  };
+
+  proto_tree_add_bitmask(tree, tvb, 0, hf_siii_mdt_version,
+                                   ett_siii_mdt_version, version_fields, ENC_LITTLE_ENDIAN);
+}
+
+static void dissect_siii_mdt_cp1_2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint telno)
+{
+  guint     devstart = telno * SERCOS_SLAVE_GROUP_SIZE; /* MDT0: slaves 0-127; MDT1: slaves 128-255; ... */
+  tvbuff_t *tvb_n;
+
+  guint idx;
+  proto_tree *subtree;
+  proto_tree *subtree_svc;
+  proto_tree *subtree_devctrl;
+
+  subtree_svc = proto_tree_add_subtree(tree, tvb, 0, SERCOS_SLAVE_GROUP_SIZE * 6, ett_siii_mdt_svc, NULL, "Service Channels");
+
+  subtree_devctrl = proto_tree_add_subtree(tree, tvb, SERCOS_SLAVE_GROUP_SIZE * 6, 512, ett_siii_mdt_svc, NULL, "Device Control");
+
+  for (idx = 0; idx < SERCOS_SLAVE_GROUP_SIZE; ++idx) /* each MDT of CP1/2 has data for 128 different slaves */
+  {
+    tvb_n = tvb_new_subset_length(tvb, 6 * idx, 6); /* subset for service channel data */
+
+    subtree = proto_tree_add_subtree_format(subtree_svc, tvb_n, 0, 6, ett_siii_mdt_svc_channel, NULL, "Device %u", idx + devstart);
+    dissect_siii_mdt_svc(tvb_n, pinfo, subtree, idx + devstart);
+
+    tvb_n = tvb_new_subset_length(tvb, SERCOS_SLAVE_GROUP_SIZE * 6 + 4 * idx, 2); /* subset for device control information */
+
+    subtree = proto_tree_add_subtree_format(subtree_devctrl, tvb_n, 0, 2, ett_siii_mdt_dev_control, NULL, "Device %u", idx + devstart);
+
+    dissect_siii_mdt_devctrl(tvb_n, pinfo, subtree);
+  }
+}
+
+static void dissect_siii_mdt_cp3_4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint telno)
+{
+  /* guint devstart _U_ = telno * SERCOS_SLAVE_GROUP_SIZE; */
+
+  if (0 == telno) /* dissect hotplug field in MDT0 only */
+    dissect_siii_mdt_hp(tvb, pinfo, tree);
+
+  /* offsets of service channel, device status and connections are unknown
+   * this data could be extracted from svc communication during CP2
+   */
+  proto_tree_add_item(tree, hf_siii_service_channels, tvb, 0, 0, ENC_NA);
+
+  proto_tree_add_item(tree, hf_siii_device_controls, tvb, 0, 0, ENC_NA);
+}
+
+static void dissect_siii_mdt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *subtree;
+  tvbuff_t   *tvb_n;
+
+  guint       t_phase;
+  guint       telno;
+
+  col_set_str(pinfo->cinfo, COL_PROTOCOL, "SIII MDT");
+
+  t_phase = (tvb_get_guint8(tvb, 1)&0x8F); /* read communication phase out of SERCOS III header */
+  telno   = (tvb_get_guint8(tvb, 0) & 0xF); /* read number of MDT out of SERCOS III header */
+
+  if (t_phase & 0x80) /* communication phase switching in progress */
+  {
+    col_append_fstr(pinfo->cinfo, COL_INFO, " Phase=CP?s -> CP%u",
+          (t_phase&0x0f));
+  }
+  else /* communication as usual */
+  {
+    col_append_fstr(pinfo->cinfo, COL_INFO, " Phase=CP%u",
+          (t_phase&0x0f));
+  }
+
+  subtree = proto_tree_add_subtree_format(tree, tvb, 0, -1, ett_siii_mdt, NULL, "MDT%u", telno);
+
+  dissect_siii_mst(tvb, pinfo, subtree); /* dissect SERCOS III header */
+
+  switch (t_phase) /* call the MDT dissector depending on the current communication phase */
+  {
+  case COMMUNICATION_PHASE_0: /* CP0 */
+    tvb_n = tvb_new_subset_length(tvb, 6, 40);
+    dissect_siii_mdt_cp0(tvb_n, pinfo, subtree);
+  break;
+
+  case COMMUNICATION_PHASE_1: /* CP1 */
+  case COMMUNICATION_PHASE_2: /* CP2 */
+    tvb_n = tvb_new_subset_length(tvb, 6, 1280);
+    dissect_siii_mdt_cp1_2(tvb_n, pinfo, subtree, telno);
+  break;
+
+  case COMMUNICATION_PHASE_3: /* CP3 */
+  case COMMUNICATION_PHASE_4: /* CP4 */
+    tvb_n = tvb_new_subset_remaining(tvb, 6);
+    dissect_siii_mdt_cp3_4(tvb_n, pinfo, subtree, telno);
+  break;
+
+  default:
+    proto_tree_add_expert(tree, pinfo, &ei_siii_cp_unknown, tvb, 6, -1);
+  }
+}
+
+
+static void dissect_siii_at_svc(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, guint devno _U_) /* devno will be used in later versions */
+{
+  static int * const svch_fields[] = {
+    &hf_siii_at_svch_valid,
+    &hf_siii_at_svch_error,
+    &hf_siii_at_svch_busy,
+    &hf_siii_at_svch_ahs,
+    NULL
+  };
+
+  proto_tree_add_bitmask(tree, tvb, 0, hf_siii_at_svch_stat,
+                                   ett_siii_at_svcstat, svch_fields, ENC_LITTLE_ENDIAN);
+
+  proto_tree_add_item(tree, hf_siii_at_svch_info, tvb, 2, 4, ENC_NA);
+}
+
+static void dissect_siii_at_devstat(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+  static int * const status[] = {
+    &hf_siii_at_dev_status_commwarning,
+    &hf_siii_at_dev_status_change_topology,
+    &hf_siii_at_dev_status_top_status,
+    &hf_siii_at_dev_status_inactive_port_status,
+    &hf_siii_at_dev_status_errorconnection,
+    &hf_siii_at_dev_status_slave_valid,
+    &hf_siii_at_dev_status_proc_command_change,
+    &hf_siii_at_dev_status_parameterization_level_active,
+    NULL
+  };
+
+  proto_tree_add_bitmask(tree, tvb, 0, hf_siii_at_dev_status,
+                                   ett_siii_at_devstatus, status, ENC_LITTLE_ENDIAN);
+}
+
+static void dissect_siii_at_hp(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+  proto_tree *subtree;
+
+  static int * const status[] = {
+    &hf_siii_at_hotplug_status_error,
+    &hf_siii_at_hotplug_status_hp0_finished,
+    &hf_siii_at_hotplug_status_param,
+    NULL
+  };
+
+  subtree = proto_tree_add_subtree(tree, tvb, 0, 8, ett_siii_at_hp, NULL, "Hot-Plug");
+
+  proto_tree_add_item(subtree, hf_siii_at_hotplug_address,              tvb, 0, 2, ENC_LITTLE_ENDIAN);
+
+  proto_tree_add_bitmask(subtree, tvb, 2, hf_siii_at_hp_stat, ett_siii_at_hp_stat, status, ENC_LITTLE_ENDIAN);
+
+  proto_tree_add_item(subtree, hf_siii_at_hp_info,                      tvb, 4, 4, ENC_NA);
+}
+
+static void dissect_siii_at_cp0(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+  guint16     seqcnt;           /* sequence counter */
+  guint16     tfield;           /* topology field for sercos addresses */
+  guint16     i;
+  proto_tree *subtree, *subtree2;
+  proto_item* ti;
+
+  subtree = proto_tree_add_subtree(tree, tvb, 0, 1024, ett_siii_recognized_devices, NULL, "Recognized Devices");
+
+  /* check sequence count field */
+  seqcnt = tvb_get_letohs(tvb, 0);
+  proto_tree_add_uint(subtree, hf_siii_at_cp0_num_devices, tvb, 0, 2, (MAX_SERCOS_ADDRESS & seqcnt)-1);
+
+  /* check SERCOS address of each topology field */
+  for (i = 1; i < MAX_SERCOS_DEVICES; ++i)
+  {
+    tfield = tvb_get_letohs(tvb, i*2);
+
+    if (tfield == 0xFFFF)
+    {
+      proto_tree_add_uint_format(subtree, hf_siii_at_cp0_sercos_address, tvb, i*2, 2, 0xFFFF, "Sercos Address %u: No Device", i);
+    }
+    else
+    {
+      ti = proto_tree_add_uint_format(subtree, hf_siii_at_cp0_sercos_address, tvb, i*2, 2, (tfield & MAX_SERCOS_ADDRESS), "Sercos Address %u: %u", i, (tfield & MAX_SERCOS_ADDRESS));
+      subtree2  = proto_item_add_subtree(ti, ett_siii_at_sercos_address);
+      proto_tree_add_item(subtree2, hf_siii_at_cp0_support_functions,  tvb, i*2, 2, ENC_LITTLE_ENDIAN);
+      proto_tree_add_item(subtree2, hf_siii_at_cp0_device_address,     tvb, i*2, 2, ENC_LITTLE_ENDIAN);
+    }
+  }
+}
+
+static void dissect_siii_at_cp1_2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint telno)
+{
+  guint     devstart = telno * SERCOS_SLAVE_GROUP_SIZE; /* AT0: slaves 0-127; AT1: slaves 128-255; ... */
+  tvbuff_t *tvb_n;
+
+  guint idx;
+
+  proto_tree *subtree;
+  proto_tree *subtree_svc;
+  proto_tree *subtree_devstat;
+
+  subtree_svc = proto_tree_add_subtree(tree, tvb, 0, SERCOS_SLAVE_GROUP_SIZE * 6, ett_siii_at_svc, NULL, "Service Channel");
+
+  subtree_devstat = proto_tree_add_subtree(tree, tvb, SERCOS_SLAVE_GROUP_SIZE * 6, 512, ett_siii_at_devstats, NULL, "Device Status");
+
+  for (idx = 0; idx < SERCOS_SLAVE_GROUP_SIZE; ++idx) /* each AT of CP1/2 has data of 128 different slaves */
+  {
+    tvb_n = tvb_new_subset_length(tvb, 6 * idx, 6); /* subset for service channel data */
+
+    subtree = proto_tree_add_subtree_format(subtree_svc, tvb_n, 0, 6, ett_siii_at_svc_channel, NULL, "Device %u", idx + devstart);
+    dissect_siii_at_svc(tvb_n, pinfo, subtree, idx + devstart);
+
+    tvb_n = tvb_new_subset_length(tvb, SERCOS_SLAVE_GROUP_SIZE * 6 + 4 * idx, 2); /* subset for device status information */
+
+    subtree = proto_tree_add_subtree_format(subtree_devstat, tvb_n, 0, 2, ett_siii_at_dev_status, NULL, "Device %u", idx + devstart);
+    dissect_siii_at_devstat(tvb_n, pinfo, subtree);
+  }
+}
+
+static void dissect_siii_at_cp3_4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint telno)
+{
+  if (0 == telno) /* dissect hotplug field in AT0 only */
+    dissect_siii_at_hp(tvb, pinfo, tree);
+
+  /* offsets of service channel, device status and connections are unknown
+   * this data could be extracted from svc communication during CP2
+   */
+  proto_tree_add_item(tree, hf_siii_service_channels, tvb, 0, 0, ENC_NA);
+  proto_tree_add_item(tree, hf_siii_device_status, tvb, 0, 0, ENC_NA);
+}
+
+
+static void dissect_siii_at(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *subtree;
+  tvbuff_t   *tvb_n;
+
+  guint8      phase;
+  guint       telno;
+
+  phase = (tvb_get_guint8(tvb, 1)&0x8F); /* read communication phase out of SERCOS III header*/
+  telno = (tvb_get_guint8(tvb, 0) & 0xF); /* read number of AT out of SERCOS III header */
+
+  col_set_str(pinfo->cinfo, COL_PROTOCOL, "SIII AT");
+
+  if (phase & 0x80) /* communication phase switching in progress */
+  {
+    col_append_fstr(pinfo->cinfo, COL_INFO, " Phase=CP?s -> CP%u",
+          (phase&0x0f));
+  }
+  else /* communication as usual */
+  {
+     col_append_fstr(pinfo->cinfo, COL_INFO, " Phase=CP%u",
+          (phase&0x0f));
+  }
+
+  subtree = proto_tree_add_subtree_format(tree, tvb, 0, -1, ett_siii_at, NULL, "AT%u", telno);
+
+  dissect_siii_mst(tvb, pinfo, subtree); /* dissect SERCOS III header */
+
+    switch (phase) /* call the AT dissector depending on the current communication phase */
+    {
+    case COMMUNICATION_PHASE_0: /* CP0 */
+      tvb_n = tvb_new_subset_length(tvb, 6, 1024);
+      dissect_siii_at_cp0(tvb_n, pinfo, subtree);
+    break;
+
+    case COMMUNICATION_PHASE_1: /* CP1 */
+    case COMMUNICATION_PHASE_2: /* CP2 */
+      tvb_n = tvb_new_subset_length(tvb, 6, 1280);
+      dissect_siii_at_cp1_2(tvb_n, pinfo, subtree, telno);
+    break;
+
+    case COMMUNICATION_PHASE_3: /* CP3 */
+    case COMMUNICATION_PHASE_4: /* CP4 */
+      tvb_n = tvb_new_subset_remaining(tvb, 6);
+      dissect_siii_at_cp3_4(tvb_n, pinfo, subtree, telno);
+    break;
+
+    default:
+      proto_tree_add_expert(tree, pinfo, &ei_siii_cp_unknown, tvb, 6, -1);
+    break;
+    }
+}
+
+/* Main dissector entry */
+static int
+dissect_siii(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+  proto_item *ti;
+  proto_tree *siii_tree;
+  guint       type;
+  const char *tel_ch;
+  const char *tel_type;
+  guint       tel_no   = 0;
+  heur_dtbl_entry_t *hdtbl_entry;
+
+  /* setup columns */
+  col_set_str(pinfo->cinfo, COL_PROTOCOL, "SERCOS III V1.1");
+  col_clear(pinfo->cinfo, COL_INFO);
+
+  /*
+   * In case the packet is a protocol encoded in the basic SercosIII transport stream,
+   * give that protocol a chance to make a heuristic dissection, before we continue
+   * to dissect it as a normal SercosIII packet.
+   */
+  if (dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, tree, &hdtbl_entry, NULL))
+    return tvb_captured_length(tvb);
+
+  /* check what we got on our hand */
+  type = tvb_get_guint8(tvb, 0);
+  if (type & 0x80) /* primary or secondary channel */
+    tel_ch = "S";
+  else
+    tel_ch = "P";
+
+  if (type & 0x40) /* master data telegram (mdt) or slave telegram (at) */
+    tel_type = "AT ";
+  else
+    tel_type = "MDT";
+
+  tel_no = type &0xF; /* even though it's reserved (the V1.1 spec states that it is reserved for additional MDT/AT) */
+
+  col_append_fstr(pinfo->cinfo, COL_INFO, "%s%u Channel=%s", tel_type, tel_no, tel_ch);
+
+  ti = proto_tree_add_item(tree, proto_siii, tvb, 0, -1, ENC_NA);
+
+  siii_tree = proto_item_add_subtree(ti, ett_siii);
+
+   /* enter the specific dissector for AT or MDT */
+  if (type & 0x40)
+    dissect_siii_at(tvb, pinfo, siii_tree);
+  else
+    dissect_siii_mdt(tvb, pinfo, siii_tree);
+
+  return tvb_captured_length(tvb);
+}
+
+static void
+sercosiii_idn_code_format( gchar *result, guint32 svc_info )
+{
+   snprintf( result, ITEM_LABEL_LENGTH, "%c-%u-%04d.%d.%d",
+       ((0xFFFF & svc_info)>>15)?'P':'S', /* private or sercos IDN */
+      (svc_info>>12)&7,                  /* parameter record */
+      (svc_info&4095),                   /* IDN */
+      (svc_info>>24) & 0xFF,             /* structure index */
+      (svc_info>>16) & 0xFF);            /* structure element */
+}
+
+void
+proto_register_sercosiii(void)
+{
+  static hf_register_info hf[] = {
+
+    { &hf_siii_mdt_version,
+      { "Communication Version", "siii.mdt.version",
+      FT_UINT32, BASE_HEX, NULL, 0,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_version_num_mdt_at_cp1_2,
+      { "Number of MDTs and ATS in CP1 and CP2", "siii.mdt.version.num_mdt_at_cp1_2",
+      FT_UINT32, BASE_HEX, VALS(siii_mdt_version_num_mdtat_cp1_2_text), 0x00030000,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_version_transmission_of_communication_parameters_mdt0_cp0,
+      { "Transmission of Communication parameters", "siii.mdt.version.mdt0_cp0_transm_comm_parameter",
+      FT_BOOLEAN, 32, TFS(&tfs_yes_no), 0x00100000,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_version_fast_cp_switch,
+      { "Fast CP switch", "siii.mdt.version.mdt0_cp0_fast_cp_switch",
+      FT_BOOLEAN, 32, TFS(&siii_mdt_version_fast_cp_switch_text), 0x00200000,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_mdt_version_switch_off_sercos_telegrams,
+      { "Switch off Sercos III telegrams", "siii.mdt.version.mdt0_cp0_switch_off_sercos_telegram",
+      FT_BOOLEAN, 32, TFS(&siii_switch_off_sercos_telegram_text), 0x00400000,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_version_initprocvers,
+      { "Initialization Procedure Version Number", "siii.mdt.version.initprocvers",
+      FT_BOOLEAN, 32, TFS(&siii_mdt_version_initprocvers_text), 0x0000FF00,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_mdt_dev_control_top_control,
+      { "Topology Control", "siii.mdt.devcontrol.topcontrol",
+      FT_UINT16, BASE_DEC, VALS(siii_mdt_devcontrol_topcontrol_text), 3<<(12),
+      NULL, HFILL }
+    },
+    { &hf_siii_at_dev_control_ident,
+      { "Identification", "siii.mdt.devcontrol.identrequest",
+      FT_UINT16, BASE_DEC, NULL, 0x8000,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_dev_control_change_topology,
+      { "Changing Topology", "siii.mdt.devcontrol.topologychange",
+      FT_UINT16, BASE_DEC, NULL, 1<<14,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_dev_control,
+      { "Word", "siii.mdt.devcontrol",
+      FT_UINT16, BASE_DEC, NULL, 0,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_at_dev_status,
+      { "Word", "siii.at.devstatus",
+      FT_UINT16, BASE_HEX, NULL, 0,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_at_dev_status_commwarning,
+      { "Communication Warning", "siii.at.devstatus.commwarning",
+      FT_UINT16, BASE_DEC, NULL, 1<<15,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_at_cp0_support_functions,
+      { "Support of requested functions", "siii.at.supfunctions",
+      FT_BOOLEAN, 16, TFS(&siii_at_cp0_support_functions_text), 1<<15,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_at_cp0_device_address,
+      { "Sercos Address", "siii.at.sercosaddress",
+      FT_UINT16, BASE_DEC, NULL, MAX_SERCOS_ADDRESS,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_at_dev_status_change_topology,
+      { "Topology Change", "siii.at.devstatus.topologychanged",
+      FT_UINT16, BASE_DEC, NULL, 1<<14,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_dev_status_top_status,
+      { "Topology Status", "siii.at.devstatus.topstatus",
+      FT_UINT16, BASE_DEC, VALS(siii_at_devstatus_topstatus_text), 0x3<<(12),
+      NULL, HFILL }
+    },
+    { &hf_siii_at_dev_status_inactive_port_status,
+      { "Port 1 Status", "siii.at.devstatus.inactportstatus",
+      FT_UINT16, BASE_DEC, VALS(siii_at_devstatus_inactiveportstatus_text), 0x3<<(10),
+      NULL, HFILL }
+    },
+    { &hf_siii_at_dev_status_errorconnection,
+      { "Topology Status", "siii.at.devstatus.errorconnection",
+      FT_UINT16, BASE_DEC, VALS(siii_at_devstatus_errorconnection_text), 1<<9,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_dev_status_slave_valid,
+      { "Slave data valid", "siii.at.devstatus.slavevalid",
+      FT_UINT16, BASE_DEC, NULL, 1<<8,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_dev_status_proc_command_change,
+      { "Procedure Command Change", "siii.at.devstatus.proccmdchange",
+      FT_UINT16, BASE_DEC, VALS(siii_at_dev_status_proc_command_change_text), 1<<5,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_dev_status_parameterization_level_active,
+      { "Parameterization level active", "siii.at.devstatus.paralevelactive",
+      FT_UINT16, BASE_DEC, NULL, 1<<4,
+      NULL, HFILL }
+    },
+
+    { &hf_siii_mdt_svch_ctrl,
+      {"SvcCtrl", "siii.mdt.svch.ctrl",
+      FT_UINT16, BASE_HEX, NULL, 0,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_svch_stat,
+      {"SvcStat", "siii.mdt.svch.stat",
+      FT_UINT16, BASE_HEX, NULL, 0,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_svch_info,
+      {"Svc Info", "siii.mdt.svch.info",
+      FT_BYTES, BASE_NONE, NULL, 0,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_svch_info,
+      {"Svc Info", "siii.at.svch.info",
+      FT_BYTES, BASE_NONE, NULL, 0,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_svch_idn,
+      {"IDN", "siii.mdt.svch.idn",
+      FT_UINT32, BASE_HEX | BASE_EXT_STRING, &siii_mdt_idn_text_ext, 0,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_svch_dbe,
+      { "Data block element", "siii.mdt.svch.dbe",
+      FT_UINT16, BASE_DEC, VALS(siii_mdt_svch_dbe_text), 0x0038,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_svch_eot,
+      {"End of element transmission", "siii.mdt.svch.eot",
+      FT_BOOLEAN, 16, TFS(&siii_mdt_svch_eot_text), 0x0004,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_svch_rw,
+      {"Read/Write", "siii.mdt.svch.rw",
+      FT_BOOLEAN, 16, TFS(&siii_mdt_svch_rw_text), 0x0002,
+      NULL, HFILL }
+    },
+    { &hf_siii_mdt_svch_mhs,
+      {"Master Handshake", "siii.mdt.svch.mhs",
+      FT_UINT16, BASE_DEC, NULL, 0x0001,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_svch_valid,
+      { "SVC process", "siii.mdt.svch.proc",
+      FT_BOOLEAN, 16, TFS(&tfs_valid_not_valid), 0x0008,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_svch_error,
+      {"SVC Error", "siii.mdt.svch.error",
+      FT_BOOLEAN, 16, TFS(&siii_at_svch_error_text), 0x0004,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_svch_busy,
+      {"Busy", "siii.mdt.svch.busy",
+      FT_BOOLEAN, 16, TFS(&siii_at_svch_busy_text), 0x0002,
+      NULL, HFILL }
+    },
+    { &hf_siii_at_svch_ahs,
+      {"Handshake", "siii.at.svch.ahs",
+      FT_UINT16, BASE_DEC, NULL, 0x01,
+      NULL, HFILL }
+    },
+#if 0
+    { &hf_siii_svch_data_telofs_telno,
+      {"Telegram Number", "siii.mdt.svch.data.telassign.telno",
+      FT_UINT16, BASE_DEC, NULL, 0xF000,
+      NULL, HFILL }
+    },
+#endif
+#if 0
+    { &hf_siii_svch_data_telofs_mdt_at,
+      {"Telegram Type", "siii.mdt.svch.data.telassign.mdt_at",
+      FT_UINT16, BASE_DEC, VALS(siii_svch_data_mdt_at_text), 0x0800,
+      NULL, HFILL }
+    },
+#endif
+#if 0
+    { &hf_siii_svch_data_telofs_offset,
+      {"Telegram Offset", "siii.mdt.svch.data.telassign.offset",
+      FT_UINT16, BASE_DEC, NULL, 0x07FF,
+      NULL, HFILL }
+    },
+#endif
+#if 0
+    { &hf_siii_svch_data_proccmd_proccmdexec,
+      {"Procedure Command Execution", "siii.mdt.svch.data.proccmd.interrupt",
+      FT_UINT16, BASE_DEC, VALS(siii_svch_data_proccmd_proccmdexec_text), 0x0002,
+      NULL, HFILL }
+    },
+#endif
+#if 0
+    { &hf_siii_svch_data_proccmd_proccmd,
+      {"Procedure Command", "siii.mdt.svch.data.proccmd.set",
+      FT_UINT16, BASE_DEC, VALS(siii_svch_data_proccmd_proccmd_text), 0x0001,
+      NULL, HFILL }
+    },
+#endif
+    { &hf_siii_mst_channel,
+      { "Channel", "siii.channel",
+        FT_UINT8, BASE_DEC, VALS(siii_mst_channel_text), 0x80,
+        NULL, HFILL }
+    },
+    { &hf_siii_mst_type,
+      { "Telegram Type", "siii.type",
+        FT_UINT8, BASE_DEC, VALS(siii_mst_type_text), 0x40,
+        NULL, HFILL }
+    },
+    { &hf_siii_mst_cyclecntvalid,
+      { "Cycle Count Valid", "siii.cyclecntvalid",
+        FT_BOOLEAN, 8, TFS(&tfs_valid_invalid), 0x20,
+        NULL, HFILL }
+    },
+    { &hf_siii_mst_telno,
+      { "Telegram Number", "siii.telno",
+        FT_UINT8, BASE_DEC, NULL, 0x0F,
+        NULL, HFILL }
+    },
+    { &hf_siii_mst_phase,
+      { "Phase", "siii.mst.phase",
+        FT_UINT8, BASE_HEX, VALS(siii_mst_phase_text), 0x8F,    /* CHANGED: SB: new value is 0x8F for masking out phase */
+        NULL, HFILL }
+    },
+    { &hf_siii_mst_cyclecnt,
+      { "Cycle Cnt", "siii.mst.cyclecnt",
+        FT_UINT8, BASE_DEC, NULL, 0x70,    /* CHANGED: SB: new value is 0x70 for masking out cycle cnt */
+        NULL, HFILL }
+    },
+    { &hf_siii_mst_crc32,
+      { "CRC32", "siii.mst.crc32",
+        FT_UINT32, BASE_HEX, NULL, 0,
+        NULL, HFILL }
+    },
+
+    { &hf_siii_mdt_hotplug_address,
+      {"Sercos address", "siii.mdt.hp.sercosaddress",
+        FT_UINT16, BASE_HEX, NULL, 0,
+        NULL, HFILL }
+    },
+    { &hf_siii_mdt_hp_ctrl,
+      {"HP control", "siii.mdt.hp.ctrl",
+        FT_UINT16, BASE_HEX, NULL, 0,
+        NULL, HFILL }
+    },
+    { &hf_siii_mdt_hp_info,
+      {"HP info", "siii.mdt.hp.info",
+        FT_BYTES, BASE_NONE, NULL, 0,
+        NULL, HFILL }
+    },
+    { &hf_siii_at_hotplug_address,
+      {"Sercos address", "siii.at.hp.sercosaddress",
+        FT_UINT16, BASE_HEX, NULL, 0,
+        NULL, HFILL }
+    },
+    { &hf_siii_at_hp_stat,
+      {"HP status", "siii.mdt.hp.stat",
+        FT_UINT16, BASE_HEX, NULL, 0,
+        NULL, HFILL }
+    },
+    { &hf_siii_at_hp_info,
+      {"HP info", "siii.at.hp.info",
+        FT_BYTES, BASE_NONE, NULL, 0,
+        NULL, HFILL }
+    },
+    { &hf_siii_mdt_hotplug_control_param,
+      {"Parameter", "siii.mdt.hp.parameter",
+        FT_UINT16, BASE_DEC | BASE_EXT_STRING, &siii_mdt_hotplug_control_functioncode_text_ext, 0xFF,
+        NULL, HFILL }
+    },
+    { &hf_siii_mdt_hotplug_control_svc_switch,
+      {"Switch to SVC", "siii.mdt.hp.switch",
+      FT_UINT16, BASE_DEC, VALS(siii_mdt_hotplug_control_svc_switch_text), 0x0100,
+        NULL, HFILL }
+    },
+
+    { &hf_siii_at_hotplug_status_param,
+      {"Parameter Received", "siii.at.hp.parameter",
+      FT_UINT16, BASE_DEC, VALS(siii_mdt_hotplug_status_ackcode_text), 0x00FF,
+        NULL, HFILL }
+    },
+    { &hf_siii_at_hotplug_status_hp0_finished,
+      {"HP/SVC", "siii.at.hp.hp0_finished",
+      FT_UINT16, BASE_DEC, NULL, 0x0100,
+        NULL, HFILL }
+    },
+    { &hf_siii_at_hotplug_status_error,
+      {"Error", "siii.at.hp.error",
+      FT_UINT16, BASE_DEC, VALS(siii_at_hotplug_status_error_text), 0x0200,
+        NULL, HFILL }
+    },
+    { &hf_siii_service_channels,
+      {"Service Channels", "siii.service_channels",
+        FT_NONE, BASE_NONE, NULL, 0x0,
+        NULL, HFILL }
+    },
+    { &hf_siii_device_controls,
+      {"Device Controls", "siii.device_controls",
+        FT_NONE, BASE_NONE, NULL, 0x0,
+        NULL, HFILL }
+    },
+    { &hf_siii_device_status,
+      {"Device Status", "siii.device_status",
+        FT_NONE, BASE_NONE, NULL, 0x0,
+        NULL, HFILL }
+    },
+    { &hf_siii_idn_code,
+      {"IDN code", "siii.idn_code",
+        FT_UINT32, BASE_CUSTOM, CF_FUNC(sercosiii_idn_code_format), 0x0,
+        NULL, HFILL }
+    },
+    { &hf_siii_at_cp0_num_devices,
+      {"Number of Devices", "siii.at.cp0.num_devices",
+        FT_UINT16, BASE_DEC, NULL, 0x0,
+        NULL, HFILL }
+    },
+    { &hf_siii_at_cp0_sercos_address,
+      {"Sercos Address", "siii.at.cp0.sercos_address",
+        FT_UINT16, BASE_DEC, NULL, 0x0,
+        NULL, HFILL }
+    },
+  };
+
+  /* Setup protocol subtree array */
+  static gint *ett[] = {
+    &ett_siii,
+    &ett_siii_header,
+
+    &ett_siii_mdt,
+    &ett_siii_mdt_version,
+    &ett_siii_mdt_svc,
+    &ett_siii_mdt_devctrls,
+    &ett_siii_mdt_svc_channel,
+    &ett_siii_mdt_dev_control,
+
+    &ett_siii_at,
+    &ett_siii_at_svc,
+    &ett_siii_at_sercos_address,
+    &ett_siii_at_devstats,
+    &ett_siii_at_svc_channel,
+    &ett_siii_at_dev_status,
+
+    &ett_siii_mdt_devctrl,
+    &ett_siii_at_devstatus,
+    &ett_siii_at_sercosaddress,
+
+    &ett_siii_mdt_svcctrl,
+    &ett_siii_mdt_svcinfo,
+    &ett_siii_at_svcstat,
+    &ett_siii_at_svcinfo,
+    &ett_siii_mdt_svch_data_error_info,
+    &ett_siii_mdt_svch_data,
+
+    &ett_siii_mst,
+    &ett_siii_mst_teltype,
+    &ett_siii_mst_phase,
+
+    &ett_siii_mdt_hp,
+    &ett_siii_at_hp,
+    &ett_siii_mdt_hp_ctrl,
+    &ett_siii_mdt_hp_info,
+    &ett_siii_at_hp_stat,
+    &ett_siii_at_hp_info,
+    &ett_siii_recognized_devices
+  };
+
+  static ei_register_info ei[] = {
+    { &ei_siii_cp_unknown, { "siii.cp_unknown", PI_PROTOCOL, PI_WARN, "CP is unknown", EXPFILL }},
+  };
+
+  expert_module_t* expert_siii;
+
+  /* Register the protocol name and description */
+  proto_siii = proto_register_protocol("SERCOS III V1.1",
+      "SERCOS III V1.1", "siii");
+
+  siii_handle = register_dissector("sercosiii", dissect_siii, proto_siii);
+
+  /* subdissector code */
+  heur_subdissector_list = register_heur_dissector_list("sercosiii", proto_siii);
+
+  /* Required function calls to register the header fields and subtrees used */
+  proto_register_field_array(proto_siii, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+  expert_siii = expert_register_protocol(proto_siii);
+  expert_register_field_array(expert_siii, ei, array_length(ei));
+}
+
+void
+proto_reg_handoff_sercosiii(void)
+{
+  dissector_add_uint("ethertype", ETHERTYPE_SERCOS, siii_handle);
+}
+
+/*
+ * Editor modelines
+ *
+ * Local Variables:
+ * c-basic-offset: 2
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=2 tabstop=8 expandtab:
+ * :indentSize=2:tabSize=8:noTabs=true:
+ */