Siemens 7SR224 - Rear RS485 Connection; Optional Rear Fibre Optic Connection

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