Siemens 7SR224 - RS232 Connections; IRIG-B Connections; Fibre Optic Connections

7SR224 Argus Installation
5.2 RS232 Connections
The Optional RS232 port is provided by a 9-way male ‘D’ connector at the relay rear as shown in Section 3: of this
document for connection to a compatible device. Connections should be made using RS232 compatible cable.
5.3 IRIG-B Connections
A BNC plug is provided to connect a co-axial cable carrying IRIG-B time synchronisation signals. Ensure that the
stub length is minimised by connecting the tee-connector directly to the rear of the relay. A suitable co-axial cable
would be type RG 58 50ohms.
5.4 Fibre Optic Connections
Rear Com ports 3 and 4 comprise Fibre–Optic ST™ (BFOC/2.5) bayonet connectors-4 per product. 62.5 / 125μm
glass fibre is recommended for all distances.
When installing fibre, ensure that the fibres’ bend radii comply with the recommended minimum for the fibre used-
typically 50mm is acceptable.
Figure 5.4-1 Data Comms to Multiple Devices Using Sigma 1 and F.O. Star Network
Laptop computer o
r
Control System
Sigma 1
Tx
Rx
Tx
Rx
25 pin male D
connector
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Master
62.5/125µm fibre optic with ST
connectors
USB or 9 pin male
D connector
RS
232 straight
through cable
To
Control
System
©2010 Siemens Protection Devices Limited Chapter 5 Page 13 of 16