Serial interface RS422

The interface contains an electrically isolated socket. It is led out via a 9-pin standard DSUB connector. The interface provides an asynchronous, serial communication method defined in the RS422 standard.

The channel features overvoltage protection.

Serial interface RS422 1:Fig.19: RS422 interface pin numbering
RS422 pin assignment

Pin

Signal

Type

Description

1

N/C

-

Not used

2

TxD +

Data-Out +

Transmit 422

3

RxD +

Data-In +

Receive 422

4

N/C

-

Not used

5

GND

Ground

Ground

6

VCC

VCC

+5 V

7

TxD -

Data-Out -

Transmit 422

8

RxD -

Data-In -

Receive 422

9

N/C

-

Not used

10

N/C

-

Not used

On delivery the interface is configured as a full duplex endpoint as standard:

RS422 standard configuration

Function

State

Echo

on

Auto send

off

Always send

on

Auto receive

off

Always receive

on

Termination

on