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Wiring the Terminal Unit
3-3-3
RS-485 Communications Wiring
RS-485 Communications
Cables
RS-485 communications can be used to connect Temperature Controllers in
remote locations to the DeviceNet Communications Unit.
Master
(PLC)
Terminating resistance
100 to 125
(1/2W)
23
24
DeviceNet Communications
Unit
RS-485 communications cables can be extended up to 500 m.
Connect terminating resistance of 100 to 125
and 24 of the devices connected to each end of the RS-485 communications
line.
Connect the RS-485 communications cables to terminals 23 and 24, as
shown in the following diagram.
19
13
7
1
20
14
8
2
21
15
9
3
B(+)
23
RS-485
A( )
24
22
16
10
4
23
17
11
5
24
18
12
6
E5ZN-SCT24S
Use shielded twisted-pair cable (AWG 28 or larger) for the RS-485 communi-
cations cables, as shown in the following diagram.
Cable Reference Diagram
DeviceNet
RS-485
23
(B)
(B)
24
(A)
(A)
Temperature
Temperature
Controller
Controller
AWG28 or larger; 0.81 mm
larger conductor cross-section
Section 3-3
23
(B)
24
(A)
Terminating
Temperature
resistance
Controller
100 to 125
(1/2W)
(1/2W) between terminals 23
2
or
31
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