Siemens SIMATIC S7-1200

Technical specifications
A.16 Communication interfaces
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1543
Table A- 248 Connector pin locations for CB 1241 RS485 (6ES7241-1CH30-1XB0)
Pin
9-Pin connector
X20
1
RS485 / Logic GND
--
2 RS485 / Not Used --
3
RS485 / TxD+
4 - T/RB
4 RS485 / RTS 6 - RTS
5
RS485 / Logic GND
--
6
RS485 / 5 V Power
--
7
RS485 / Not used
--
8
RS485 / TxD-
3 - T/RA
9
RS485 / Not Used
--
Shell
1 - M
A.16.4.2
CM 1241 RS232 specifications
Table A- 249 General specifications
Technical data
CM 1241 RS232
Article number
6ES7241-1AH32-0XB0
Dimensions (mm)
30 x 100 x 75
Weight
150 grams
Table A- 250 Transmitter and receiver
Technical data
CM 1241 RS232
Type
RS232 (full-duplex)
Transmitter output voltage
+/- 5 V min. at R
L
= 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
RS 232 signal to chassis ground
RS 232 signal to CPU logic common
707 V DC (type test)
Cable length, shielded 10 m max.
Baud rate 300 baud, 600 baud, 1.2 kbits, 2.4 kbits, 4.8 kbits, 9.6 kbits (default),
19.2 kbits, 38.4 kbits, 57.6 kbits, 76.8 kbits, 115.2 kbits
Parity No parity (default), even, odd, Mark (parity bit always set to 1),
Space (parity bit always set to 0)
Number of stop bits
1 (default), 2
Flow control
Hardware, software
Wait time
0 to 65535 ms