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9-7
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-3 T
rou
b
lesho
o
ting
9
9-3-1 Ser
ial Gat
e
w
a
y (Ser
ia
l Gate
w
a
y or Protocol Macro
Mode)
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. Either the
SD@ or RD@
indicator
flashes. 0205 hex
(response tim-
eout). *_P1(orP2)_Ti
meoutErr (Tim-
eout Error) is
set to TRUE. The response from
the remote device
was too fast and the
data received by the
Unit was discarded. Delay the response from
the remote device.
The SD
@
indi-
cators flash,
but a
response is
not always
returned.
0205 hex
(response tim-
eout) occurs
sometimes. *_P1(orP2)_Tra
nsErr,
*_P1(orP2)_
OverRunErr,
*_P1(orP2)_Fra
mingErr,
*_P1(orP2)_Par
ityErr
(Transmission
Error, Overrun
Error, Framing
Error, or Parity
Error) is TRUE.
A hardware error
occurred in the
reception circuit of
the Unit. Conduct a loopback test in
serial communications
mode to check the trans-
mission lines. If an error
occurs during the test,
replace the Unit.
The
RD
@ /SD @
indicators
flash, but a
response is
not always
returned.
A transmission error
occurred due to
noise. Use shielded twisted-pair
cables.
Lay power lines separately
by using ducts.
Increase the number of
resends at the command
source.
Perform communications
retry if required.
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.