Siemens Argus 7SR22 - Standard Rear RS485 Connection; Optional Rear Fibre Optic Connection

7SR210 & 7SR220 Configuration Guide
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2.1.2 STANDARD REAR RS485 CONNECTION
Figure 2.1.2-1 Standard rear RS485 connection to a PC
2.1.3 OPTIONAL REAR FIBRE OPTIC CONNECTION
Figure 2.1.3-1 Additional (Optional) rear fibre optic connection to a 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