Справочник Пользователя для Black Box 945
How to Use Data Communications
4
WATLOW Series 945
19
20
20
21
22
22
23
T +
T -
R +
R +
R -
Signal Common
(Optional)
Series 945 #1
Series 945 #10
Twisted Pair Wire
1
2
3
4
5
9
8
7
6
19
20
21
21
22
23
T +
T -
R +
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
RS-422A Interface Pinouts
945A-XXXX-B000
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.
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.
may vary depending on models. Refer to your computer user's manual for more
information.
Figure 1 -
RS-422A Interface,
RS-422A Interface,
Pin Designations.
NOTE:
The Electronic
Industry Association
(EIA) RS-422A
standard recom-
mends a maximum
4000 ft. total network
distance.
Industry Association
(EIA) RS-422A
standard recom-
mends a maximum
4000 ft. total network
distance.