Siemens 7SR224 - Page 144

7SR224 Argus Data Comms
©2010 Siemens Protection Devices Limited Chapter 4 Page 10 of 76
Setting name Range Default Setting Notes
COM4 Parity
NONE, ODD, EVEN EVEN As Required
The parity set on all of the
relays connected to the
same fibre optic system
must be the same and in
accordance with the master
device.
COM4 Line Idle
LIGHT ON, LIGHT OFF LIGHT OFF As Required
Sets the idle state of the line
in accordance with master
device
COM4 Data Echo
ON,OFF OFF As Required
Set to ON when relays are
connected in a ring
configuration.
COM4 Mode
Local, Remote, Local Or
Remote
Remote Remote
Selects port mode
RS232 to Fibre
Optic Converter
Tx
Rx
Tx
Rx
62.5/125µm fibre optic with ST
connectors
Tx
Rx
Tx
Rx
Computer or
Control System
USB or 9 pin male
D connector
RS232 straight
through cable
25 pin male
D connector
Figure 2-3 Communication to Multiple Devices using Fibre-optic Ring Network