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11. Troubleshooting
Modbus RTU mode communication check
Phenomenon
Confirmation and countermeasures
RUN LED does not illuminate.
Confirm that the power supply is correctly supplied to the power supply terminal of
the AD-8551R.
・
Is the voltage appropriate? (12 to 24 VDC)
・
Is the cable connected correctly?
RXD LED does not flash.
Confirm that the weighing device is connected and set correctly.
・
Is the cable properly connected to the RS-232C terminal?
・
Is the proper cable used?
・
Is the data output from the weighing device?
(Set the weighing device to stream mode.)
・
Is the weighing device in weighing mode?
(Is the display off, CAL mode on internal setting mode, etc?
)
RD LED does not flash.
Confirm that the connection with the host is correct.
・
Is the cable properly connected to the RS-485 terminal?
・
Is a signal output from the host?
RUN LED is flashing.
RS-232C or RS-485 communication error.
Confirm whether RS-232C or RS-485 is in error
⋆
1
and change
the communication settings.
SD LED does not flash.
Confirm the signal contents from the host.
・
Is the AD-8551R set to command mode?
・
Does the device address specified on the host side match the device
address set on the AD-8551R?
・
Is the content sent from the host suitable for the command mode format?
Send the same content as “9-5 Communication format” from the host.
The data received by the host is
corrupted.
Are multiple AD-8551R set to the same device address?
Non-weighing status flag is “1”.
Confirm the settings of the weighing device.
・
Is the RUN LED flashing slowly (RS-232C communication error)
⋆
1
?
Confirm the RS-232C communication settings.
・
Is the weighing device output format set to the A&D standard format.
AD-8551R settings cannot be
changed.
Turn the AD-8551R off and the on again. When the power is turned on, the switch
status is read and reflected in the operation.
⋆1.
Refer to “8. LED (status, error display)”.