RS485 PCIe® compact module

The RS485 PCIe® compact module contains two electrically isolated ix Industrial® type B sockets for asynchronous, serial high-speed data transmission. Two ix Industrial® type B to D-sub, 9-pin adapter cables are required (order identifier C9900-K922). The adapter cables are 45 cm long. The signal transfer takes place symmetrically.

RS485 PCIe® compact module 1:Fig.8: RS485 pin numbering
RS485 pin assignment

Pin

Signal

Type

Description

1

N/C

-

Not used

2

TxD +

Data-Out +

Transmit 485

3

RxD +

Data-In +

Receive 485

4

N/C

-

Not used

5

GND

Ground

Ground

6

VCC

VCC

+5 V

7

TxD-

Data-Out -

Transmit 485

8

RxD-

Data-In -

Receive 485

9

N/C

-

Not used

10

N/C

-

Not used

Pins 2 and 3 (data +) and pins 7 and 8 (data -) must be connected.

On delivery the interface is configured as a half-duplex endpoint without echo as standard – see table below:

RS485 standard configuration

Function

State

Echo

off

Auto send

on

Always send

off

Auto receive

on

Always receive

off

Termination

on