Communication Wiring - YOKOGAWA ZR22G User Manual

5.2.11

Communication wiring

ZR802G wired digital communication can be Ethernet(Modbus TCP) or RS-485 (Modbus RTU)
depending on your requirements.
Be sure to use shielded cables to prevent malfunction due to external noise ad to avoid the
effects of radiated noise from ZR802G on other equipment.
RS-485 cable
l
Use RS-485 cable when the digital communication code-M (Modbus RTU) is selected. All RS-
485 terminal screws are clamping terminals.
Figure 5.16
Table 5.3
Terminal
36
37
38
39
40
41
Use a multi-core shielded cable with stranded core wires (twisted pair). The shield connects to
terminal 36.
Termination resistor for signal (resistance value 110 Ω) is built-in. Perform termination according
to the communication environment.
When terminating, connect terminals 40 and 41 using a jumper as shown in Figure 5.17.
Figure 5.17
RS-485 terminal screw
RS-485 Terminal Assignments
Name
GNDF shield
GND signal GND
B data (negative electrode)
A data (positive electrode)
TER terminal resistor (110Ω)
TER terminal resistor (110Ω)
How to terminate RS-485
Application
<5. Wiring>
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
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