Black Box 945 User Manual

How to Use Data Communications

WATLOW Series 945

T +

T -
R +

R -

Signal Common

(Optional)

Series 945      #1

Series 945      #10

Twisted Pair Wire

1

2

3

4

5

9

8

7

6

T +

T -

R +
R -

Signal Common

(Optional)

Twisted Pair Wire

T +

T -

R +

R -

Com

Host Computer

(rear view)

DB-9 female

connector

(viewed from wire side)

RS-422A

The RS-422A communications uses a four wire (full duplex) system.  There are
two separate lines for transmitting, and two lines for receiving data between the
computer and the Series 945.  With RS-422A you can have from one to ten Series
945 controls connected to a single computer.

This diagram is a typical wiring example.  The connections on the host computer
may vary depending on models.  Refer to your computer user's manual for more
information.