RKC INSTRUMENT PG500, Communication Instruction Manual

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7. TROUBLESHOOTING
IMR02F04-E1
60
Continued from the previous page.
Problem Possible cause Solution
EOT return The specified identifier is invalid Confirm the identifier is correct or that with
the correct function is specified. Otherwise
correct it
Error in the data format Reexamine the communication program
NAK return Error occurs on the line (parity bit error,
framing error, etc.) Confirm the cause of error, and solve the
problem appropriately. (Confirm the
transmitting data, and resend data)
BCC error
The data exceeds the setting range Confirm the setting range and transmit correct
data
The specified identifier is invalid Confirm the identifier is correct or that with
the correct function is specified. Otherwise
correct it

Modbus
Problem Possible 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
The communication settings (device address,
communication speed, data bit configuration,
etc.) were not enabled after being changed. After all communication parameters are set,
the PG500 power is turned on again after
turning it off once.
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
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.