Black Box 945 Manual De Usuario
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5
WATLOW Series 945
How to Use Data Communications
RS-423A Interface Pinouts (RS-232C Compatible)
945A-XXXX-B000
The RS-423A communications uses a three wire (full duplex) system. There is a
separate line for transmitting, a line for receiving data, and a line for signal common
between the computer and the Series 945. With RS-423A you can have only one
Series 945 control connected to a single computer or printer.
separate line for transmitting, a line for receiving data, and a line for signal common
between the computer and the Series 945. With RS-423A you can have only one
Series 945 control connected to a single computer or printer.
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.
945 #1
20
21
23
Signal Common
R
T
Com
Host Computer
(rear view)
T
Jumper to Signal Common
1
2
3
4
5
5
9
8
7
6
10
11
12
13
14
15
16
17
18
19
2 0
21
22
23
24
25
R
RLSD (Received Line Signal Detector)
DSR (Data Set Ready)
RTS (Request To Send)
CTS (Clear To Send)
22
DB-25 female
connector
(viewed from wire side)
R, and RLSD together.
S and CTS together.
mputer's user manual.
DTR (Data Terminal Ready)
3
4
RS-423A
Figure 2 -
RS-423A Interface,
Pin Designations.
RS-423A Interface,
Pin Designations.
NOTE:
The Electronic
Industry Association
(EIA) RS-423A
standard recom-
mends a maximum
50 foot total point-
to-point distance.
Industry Association
(EIA) RS-423A
standard recom-
mends a maximum
50 foot total point-
to-point distance.