Siemens 7SR224 Technical Manual page 224

Laptop computer or
Control System
Figure 5.4-2 Data Comms to Multiple Devices Using Sigma 3 and F.O. Ring Network
The fibre optic data comms link will be broken if the relay element is withdrawn from the case.
©2010 Siemens Protection Devices Limited
Sigma 3
USB or 9 pin male
Tx
D connector
Rx
RS 232 straight
through cable
25 pin male D
connector
7SR224 Argus Installation
Rx
Rx
Tx
Tx
Rx
Tx
62.5/125µm fibre optic with ST
connectors
Chapter 5 Page 14 of 16