Siemens 7SR21 Manual

Also see for Argus 7SR21: Installation guide Manual Technical manual Manual Manual

7SR21 & 7SR22 Data Communications©2010 Siemens Protection Devices Limited Chapter 4 Page 9 of 15There are two optional ports, com3 and com4, and when fitted the associated settings are available in the DataCommunication menu. To allow communication using either or both of these ports the relay settings must bechanged, via the fascia, in accordance with the method of connection and master device.Setting name Range Default Setting NotesStation Address1 – 254 for IEC60870-5-1030 – 247 for Modbus RTU0 – 65520 for DNP3.00 As RequiredAn address within the range ofthe relevant protocol must begiven to identify the relay. Eachrelay must have a uniqueaddress.COM3 Protocol OFF, IEC60870-5-103,MODBUS-RTU, DNP3.0IEC60870-5-103 As RequiredSets the protocol used tocommunicate on the connection– Com3COM3 Baud Rate75 110 150 300 600 12002400 4800 9600 1920038400 57600 11520057600 As RequiredThe baud rate set on all of therelays connected to the controlsystem must be the same asthe one set on the masterdevice.COM3 Parity NONE, ODD, EVEN EVEN As RequiredThe parity set on all of therelays connected to the controlsystem must be the same andin accordance with the masterdevice.COM3 Line Idle* LIGHT ON, LIGHT OFF LIGHT OFF As Required Sets the idle state of the line inaccordance with master deviceCOM3 Data Echo* ON,OFF OFF As RequiredSet to ON when relays areconnected in a ringconfiguration.COM4 Protocol** OFF, IEC60870-5-103,MODBUS-RTU, DNP3.0IEC60870-5-103 As RequiredSets the protocol used tocommunicate on the connection– Com4.COM4 Baud Rate**75 110 150 300 600 12002400 4800 9600 192003840057600 As RequiredThe baud rate set on all of therelays connected to the controlsystem must be the same asthe one set on the masterdevice.COM4 Parity** NONE, ODD, EVEN EVEN As RequiredThe parity set on all of therelays connected to the controlsystem must be the same andin accordance with the masterdevice.COM4 Line Idle** LIGHT ON, LIGHT OFF LIGHT OFF As Required Sets the idle state of the line inaccordance with master deviceCOM4 Data Echo** ON,OFF OFF As RequiredSet to ON when relays areconnected in a ringconfiguration.*Not applicable for RS 485 or RS 232 options**COM 4 is fibre optic only