Siemens SIMATIC S7-1200 System Manual page 1545

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Technical data

RS485 signal to chassis ground

RS485 signal to CPU logic common

Cable length, shielded

Number of stop bits

Flow control

Table A- 255 Power supply

Technical data

Power loss (dissipation)

From +5 V DC

Table A- 256 RS485 or RS422 connector (female)

Logic or communication ground

Connected for RS422

Not used for RS485: Output

Signal B (RxD/TxD+): Input/Output

Request to send (TTL level) Output

Logic or communication ground

Pin 2 (TxD+) and Pin 9 (TxD-) are the RS422 transmit signals.

Pin 3 (RxD/Tx+) and Pin 8 (RxD/TxD-) are RS485 transmit and receive signals. For RS422, Pin 3 is RxD+ and Pin 8 is

The RTS is a TTL level signal and can be used to control another half duplex device based on this signal. It is active

when you transmit and is inactive all other times.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

A.17 TeleService (TS Adapter and TS Adapter modular)

CM 1241 RS422/485

707 V DC (type test)

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

Technical specifications

+5 V with 100 ohm series resistor: Output

Not connected

Signal A (RxD/TxD-): Input/Output

Connected for RS422

Not used for RS485: Output

Chassis ground

Siemens SIMATIC S7-1200 System Manual page 1545

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