10. TROUBLESHOOTING
IMR02E20-E1
105
Host communication (Modbus)
Problem Probable
cause
Solution
No response Wrong connection, no connection or
disconnection of the communication cable
Confirm the connection method or
condition and connect correctly
Breakage, wrong wiring, or imperfect
contact of the communication cable
Confirm the wiring or connector and
repair or replace the wrong one
Mismatch of the setting data of
Communication speed and Data bit
configuration with those of the host
computer
Confirm the settings and set them
correctly
Wrong address setting
There is length of query message exceeds
set range
A transmission error (overrun error, framing
error, parity error or CRC-16 error) is found
in the query message
Re-transmit after time-out occurs or verify
communication program
The time interval between adjacent data in
the query message is too long, exceeding
24-bit time
Error code 1 Function cod error
(Specifying nonexistent function code)
Confirm the function code
Error code 2 When the mismatched address is specified
Confirm the address of holding register
Error code 3
When the specified number of data items
in the query message exceeds the
maximum number of data items available
When the data written exceeds the setting
range
Confirm the setting data
Error code 4 Self-diagnostic error
Turn off the power to the instrument. If
the same error occurs when the power is
turned back on, please contact RKC sales
office or the agent.
