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9 Troubleshooting and Maintenance
9-6
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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Transmission Successful but Response from Remote Device Not Received
Error conditions Cause Remedy
Unit status Serial
communica-
tions mode
Indicator
display
Command
end code sent
to command
source
Confirmation
of device
variable for
CJ-series Unit,
etc.
The converted
command
could be sent
to the remote
device but a
normal
response is not
received from
the remote
device. The serial
communica-
tions mode is
set to Serial
Gateway or
Protocol Macro
Mode. The SD @ indi-
cators flash
but the RD
@
does not
flash.
0205 hex
(response tim-
eout). *_P1(orP2)_Ti
meoutErr (Tim-
eout Error) is
set to TRUE. A Serial Gateway
response timeout
occurred and you
cannot receive the
response data after
the timeout. Either
of the following
causes is possible. Perform the following reme-
dies.
A remote device
that can receive
the command
after conversion
does not exist at
the specified
command desti-
nation address. Check the device at the
specified command desti-
nation address.
The sent com-
mand frame is
illegal. Revise the command
frame to be converted.
The communica-
tions conditions
and baud rate
settings for the
serial communi-
cations path do
not match the
settings at the
remote device. Revise the system settings
and at the remote device.
Cable connec-
tions are incor-
rect or faulty.
The terminating
resistance switch
setting is not cor-
rect for RS-
422A/485 port.
Adapters such as
the NT-AL001
are incorrectly
wired or termi-
nating resis-
tance is not set
correctly.
• Check the wiring.
• Turn ON the terminating
resistance switch at two
end locations (remote
device or Unit) and turn
OFF the terminating
resistance switch of all
other Units.
A command was
sent in a protocol
not understood
by the remote
device. Check the command speci-
fications of the remote
device and the source of
command conversion.
A hardware error
occurred in the
remote device. Replace the remote device.