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Troubleshooting
Check the following items when the unit cannot communicate.
Is the power turned on to all of the equipment related to communication?
Are the wire connections correct? (Are the + and – poles matching?)
Are the communication settings the same between the master (the top computer) and the slave (micro controller)?
Communication speed
Data
Stop bit
Parity
Does the transmission signal timing satisfy "Chapter 5, MODBUS Communication Protocol" (p. 17)?
Is the station number specified as the sending location from the master set at something other than "0"?
The communication function does not work when set to "0".
When using RS-485, is the 7th digit of the model number (PXG
When using RS-485, are the communication settings the same for the RS-232C to RS-485 converter?
Chapter
9
: 9600bps, 19200 bps
: 8-bit
: 1-bit
:
Odd
Even
None
– 78 –
) any of M, V, K, J, U or F?
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