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WPMZ Series Modbus communication instruction manual
IM-0862-02
Number of pages:109
5
2-3.
Module wiring (RS-485 communication option)
2-3-1.
Wiring method
The Modbus communication wiring is wired in a daisy chain (daisy chaining).
If there are multiple branches from the star wiring or module, it may not be able to communicate
properly.
2-3-2.
Connection terminal
This section describes the Modbus (RS485) connection terminals of the module.
1.
WPMZ-5/6
Modbus (RS485) connection terminal of WPMZ-5/6 is as shown below.
28 and 31, 29 and 32 are conducting inside the equipment respectively.
(Since the connector inside does not have continuity, communication lines and remove the connector
will be disconnected.)
Table 2.3 Connector contents
Terminal number
Symbol
Contents
28,31
RS485
+
Non-inverting signal
29,32
-
Inverting signal
30
SG
Signal ground
33,34
TERM (※)
Terminal resistance
(
120Ω
)
terminals
* Short 33 and 34 to be enable the resistance.
Figure 2.1 Wiring of Modbus communication
terminal
terminal
terminal
terminal
terminal
terminal
Correct wiring
(Daisy chain)
Incorrect wiring
(Star wiring)
Incorrect wiring
(There is a branch
on the way)
Figure 2.2 Modbus communication wiring
+
RS-485
T
E
R
M
T
E
R
M
S
G
-
+
RS-485
-
34
28 29 30 31 32 33
* 、 & 、 :connected internally
28 31
29 32
Suitable wire:AWG24 to 16
Master
Master
Master