Rear Rs485 Connection; Optional Rear Fibre Optic Connection - Siemens 7SR224 Technical Manual

2.1.2

Rear RS485 connection

2.1.3

Optional rear fibre optic connection

Sigma devices have a 25 pin female D connector with the following pin out.
Pin
2
3
4
5
6
7
8
20
©2010 Siemens Protection Devices Limited
7SR224 Argus Settings, Configuration & Instruments
Figure 2.1.2-1 RS485 connection to PC
Figure 2.1.3-1 Fibre Optic Connection to PC
Received Line Signal Detector
Function
Transmit Data
Received Data
Request to Send
Clear to Send
Data set ready
Signal Ground
Data Terminal Ready
Chapter 2 Page 10 of 13