7SR21 & 7SR22 - Installation Guide
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6.3 Additional (Optional) Fibre Optic Connections
Rear Com ports 3 and 4 comprise Fibre–Optic ST™ (BFOC/2.5) bayonet connectors-4 per product. 62.5 / 125 μm
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 50 mm is acceptable.
Computer or
Control System
7SG24
Tx
Rx
Tx
Rx
62.5/125 µm fibre optic
with ST connectors
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
Master
To
Control
System
USB or 9 pin male
D connector
RS232 straight
Through cable
25 pin male
D connector
Figure 6.3-1 Data Comms to Multiple Devices Using 7SG24 and F.O. Star Network
Figure 6.3-2 Data Comms to Multiple Devices Using 7SG24 and F.O. Ring Network
The F.O. data communications link with a particular relay will be broken if the relay element is withdrawn from the
case, all other relays will still communicate.
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