Watlow Series 734 Data Communications - Manual (Page 4)

How to Use Data Communications
4
WATLOW Series 733/734
RS-422
Figure 1 -
EIA/TIA-422 Inter-
face, Wiring Dia-
gram.
˜
NOTE:
The Electronic
Industry Associa-
tion (EIA) EIA/TIA-
422 standard
recommends a
maximum 4000 ft.
total network
distance.
EIA/TIA-422 Interface Pinouts
73xx-xxxx-xBxx
The EIA/TIA-422 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 733/734. With EIA/TIA-422 you can have from one to ten
Series 733/734 controls connected to a single computer.
This diagram is a typical wiring example. The connections on the host computer
may vary depending on models. See page 7 for information about serial interfaces.
Refer to your computer user's manual for more information.
12
11
10
9
8
7
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
Twisted Pair Wire
Twisted Pair Wire
Twisted Pair Wire
Twisted Pair Wire
Common Pin 8
Common Pin 8
B'
A'
B
A
Gnd.
EIA/TIA-232
to
EIA/TIA-422
Converter
Series
733 / 734
#1
Series
733 / 734
#2
T+
T-
R+
R-
Com
T+
T-
R+
R-
Com
R+
R-
T+
T-
Com