Rs232 Connections; Irig-B Connections; Fibre Optic Connections; Figure 5.4-1 Data Comms To Multiple Devices Using Sigma 1 And F.o. Star Network - Siemens 7SR224 Manual

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.
Laptop computer or
Control System

Figure 5.4-1 Data Comms to Multiple Devices Using Sigma 1 and F.O. Star Network

©2010 Siemens Protection Devices Limited
To
Control
System
Sigma 1
Tx
Master
USB or 9 pin male
D connector
Tx
Rx
RS 232 straight
through cable
25 pin male D
connector
7SR224 Argus Installation
Rx
Rx
Rx
Tx
Tx
Tx
Rx
Tx
Rx
Tx
Rx
Rx
Tx
62.5/125µm fibre optic with ST
connectors
Chapter 5 Page 13 of 16