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WPMZ Series Modbus communication instruction manual
IM-0862-02
Number of pages:109
6
2-3-3.
Configuration diagram example
The configuration example of WPMZ - 5/6 is shown below.
1.
About communication cable
Please use a shielded cable that meets the following specifications.
Table 2.4 Communication cable specification
Product name
Size
Total cable extension
WPMZ-5/6
AWG24~16
1.2km or less
2.
About connection of terminating resistor
Up to 31 slaves (modules) can be connected.
At that time, please set the terminating resistor for the module which becomes the terminal equipment
of the line.
In the case of WPMZ-5/6, connect the TERM terminals together.
If this product is not a terminal equipment of the line, please do not set the termination resistor.
When connecting via Modbus using the USB - RS 485 converter, even if the master is a personal
computer, set the terminating resistor in the USB - RS 485 converter. (See the figure below)
Note: Do not configure multiple masters to connect to the same slave (module).
Communication may not be performed correctly and data may not be taken.
Figure 2.3 Terminating resistance when USB-RS 485 converter is used
Master
Set the
terminating
resistance
Set the
terminating
resistance
USB-RS485
converter
Computer
Slave (module)
USB
RS485
RS485