Siemens SIMATIC S7 System Manual page 757
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Also See for SIMATIC S7:
- System manual (866 pages) ,
- Functional safety manual (212 pages) ,
- User manual (134 pages)
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Technical data
Receiver threshold/sensitivity
Isolation
RS485 signal to chassis ground
RS485 signal to CPU logic common
Cable length, shielded
Baud rate
Parity
Number of stop bits
Flow control
Wait time
Table A- 167 Power supply
Technical data
Power loss (dissipation)
From +5 VDC
Table A- 168 RS485 or RS422 connector (female)
Pin
Description
1
Logic or communication ground
2 TxD+
Connected for RS422
1
Not used for RS485: Output
3 TxD+
Signal B (RxD/TxD+): Input/Output
4 RTS
Request to send (TTL level) Output
2
5 GND
Logic or communication ground
Pins 2 and 9 are only used as transmit signals for RS422.
1
The RTS is a TTL level signal and can be used to control another half duplex device based on this signal. It is active
2
when you transmit and is inactive all other times.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
CM 1241 RS422/485
+/- 0.2 V min., 60 mV typical hysteresis
500 VAC, 1 minute
1000 m max. (baud rate dependent)
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,
No parity (default), even, odd, Mark (parity bit always set to 1),
Space (parity bit always set to 0)
1 (default), 2
XON/XOFF supported for the RS422 mode
0 to 65535 ms
CM 1241 RS422/485
1.2 W
240 mA
Connector
Pin
(female)
6 PWR
7
8 TXD-
9 TXD-
SHELL
553BTechnical specifications
A.10 Communication interfaces
Description
+5V with 100 ohm series resistor: Output
Not connected
Signal A (RxD/TxD-): Input/Output
Connected for RS422
1
Not used for RS485: Output
Chassis ground
757
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