Communication - Panasonic KT4H User Manual

14.4 Communication

If any malfunctions occur, refer to the following items after checking the power supply to the master
and the slave.
Problem
Communication failure
Although communication is
occurring, the response is
"NAK".
For all other malfunctions, please contact our main office or dealers.
Presumed cause and solution
• Make sure that communication connector is securely connected.
• Check that wiring of the communication connector is correct.
(Refer to Section "12.2 Wiring".)
• Burnout or imperfect contact on the communication cable and the
connector.
• Communication speed of the slave does not coincide with that of the
master.
(Refer to Section "12.3 Communication parameter setting".)
• The data bit, parity and stop bit of the master do not accord with those of
the slave.
(Refer to Section "12.3 Communication parameter setting".)
• The instrument number (address) of the slave does not coincide with that
of the command.
(Refer to Section "12.3 Communication parameter setting".)
• The instrument numbers (addresses) are duplicated in multiple slaves.
(Refer to Section "12.3 Communication parameter setting".)
• Make sure that the program is appropriate for the transmission timing.
(Refer to Section "12.4 Communication procedures".)
• Check that a non-existent command code has not been sent.
• The setting command data exceeds the setting range of the slave.
• The controller cannot be set when functions such as AT are performing.
• The KT4H/B is in the front key operation setting mode.
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