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WPMZ Series Modbus communication instruction manual
IM-0862-02
Number of pages:109
108
6.
Troubleshooting
6-1.
About communication
6-1-1.
Communication abnormal
If the communication isn
’
t possible、please check the following items.
Are all the devices relate to communication turned on?
Is the wiring correct?
Are the number of connected devices and the connection distance are appropriate?
Do communication condition settings match between Master and Slave (Module)?
(baud rate, data length, stop bit, parity)
Dose the timing of transmit and receive signals satisfy
3-2. Transmission Switching Time
?
Dose the slave ID specified as the transmission destination from the master match the slave ID
setting of the connected slave (module)?
Is the same slave ID set for the modules connected on the same transmission line?
Is a terminal resistance attached on the transmission line?
6-1-2.
The acquired data is abnormal
If data can be acquired but value is wrong, please check the following items.
Is the function code correct?
Is the address the address of the data to be obtained?
Is conversion carried out?