Siemens Simatic S7 Series

Technical specifications
A.8 RS485/RS232 signal boards
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
645
Table A- 142 RS232 Transmitter and receiver
Technical data
SB RS485/RS232
Transmitter output voltage
+/-5 V min. at RL = 3K Ω
Transmit output voltage +/- 15 V DC max.
Receiver input impedance
3 K Ω min.
Receiver threshold/sensitivity 0.8 V min. low, 2.4 max. high
0.5 V typical hysteresis
Receiver input voltage
+/- 30 V DC max.
Isolation
RS232 signal to chassis ground
RS232 signal to CPU logic
common
None
Cable length, shielded
10 m max.
Table A- 143 Wiring diagram for the SB CM01 RS485/RS232 (6ES7 288-5CM01-0AA0)
SB CM01 RS485/RS232 (6ES7 288-5CM01-0AA0)
Table A- 144 Connector pin locations for SB CM01 RS485/RS232 (6ES7 288-5CM01-0AA0)
Pin
X20
1
Functional Earth
2 Tx/B
3
RTS
4
M
5
Rx/A
6
5 V Out (Bias Voltage)