Siemens SIMATIC S7-1200

Technical specifications
A.16 Communication interfaces
S7-1200 Programmable controller
1544 System Manual, V4.2, 09/2016, A5E02486680-AK
Table A- 251 Power supply
Technical data
CM 1241 RS232
Power loss (dissipation)
1 W
From +5 V DC 200 mA
Table A- 252 RS232 connector (male)
Pin
Description
Connector
(male)
Pin
Description
1 DCD
Data carrier detect: Input
6 DSR
Data set ready: Input
2 RxD Received data from DCE: Input 7 RTS Request to send: Output
3 TxD
Transmitted data to DCE: Output
8 CTS
Clear to send: Input
4 DTR
Data terminal ready: Output
9 RI
Ring indicator (not used)
5 GND Logic ground SHELL Chassis ground
A.16.4.3
CM 1241 RS422/485 specifications
CM 1241 RS422/485 Specifications
Table A- 253 General specifications
Technical data
CM 1241 RS422/485
Article number
6ES7241-1CH32-0XB0
Dimensions W x H x H (mm)
30 x 100 x 75
Weight
155 grams
Table A- 254 Transmitter and receiver
Technical data
CM 1241 RS422/485
Type
RS422 or RS485, 9-pin sub D female connector
Common mode voltage range
-7 V to +12 V, 1 second, 3 VRMS continuous
Transmitter differential output voltage 2 V min. at R
L
= 100 Ω
1.5 V min. at R
L
= 54 Ω
Termination and bias 10K Ω to +5 V on B, PROFIBUS Pin 3
10K Ω to GND on A, PROFIBUS Pin 8
Internal bias options provided, or no internal bias. In all cases, exter-
nal termination is required, see Biasing and terminating an RS485
network connector (Page 1088) and Configuring the RS422 and
RS485 in the S7-1200 Programmable Controller System Manual
(Page 1140)
Receiver input impedance
5.4K Ω min. including termination
Receiver threshold/sensitivity +/- 0.2 V min., 60 mV typical hysteresis