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WATLOW Series 942 How to Use Data Communications

RS-422A Interface Pinouts

942A-XXXX-B000

Figure 1 -

RS-422A Interface,

Pin Designations.

RS-422A

T +

T -

R +

R -

Signal Common

(Optional)

Series 945 #

Series 945 #1

Twisted Pair Wire

T +

T -

R +

R -

Signal Common

(Optional)

Twisted Pair Wire

T +

T -

R +

R -

Com

Host Compute

(rear view)

DB-9 female

connector

(viewed from wire side)

Series 942

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 942. With RS-422A you can have from one to ten

Series 942 controls connected to a single computer.

This diagram is a typical wiring example. The connections on the host com-

puter may vary depending on models. Refer to your computer user's manual

for more information.

NOTE:

The Electronic

Industry Association

(EIA) RS-422A

standard recom-

mends a maximum

4000 ft. total network

distance.

NOTE:

DB-25 Could be

used for DB-9

depending on serial

port connector

Burr-Brown Interface

See reference P.7A

1 2 3 4 5 6 7 8 9 ... 27 28

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