Omron CJ1W-SCU32 Operation Manual page 285

Unit status Serial
communica-
tions mode
The converted The serial
command communica-
could be sent tions mode is
to the remote
set to Serial
device but a
Gateway or
normal
Protocol Macro
response is not Mode.
received from
the remote
device.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Error conditions
Indicator Command
display end code sent
to command
source
Either the 0205 hex
SD@ or RD@ (response tim-
indicator eout).
flashes.
The SD@ indi- 0205 hex
cators flash, (response tim-
but a eout) occurs
response is sometimes.
not always
returned.
The
RD@/SD@
indicators
flash, but a
response is
not always
returned.
9 Troubleshooting and Maintenance
Cause
Confirmation
of device
variable for
CJ-series Unit,
etc.
*_P1(orP2)_Ti The response from
meoutErr (Tim- the remote device
eout Error) is was too fast and the
set to TRUE. data received by the
Unit was discarded.
*_P1(orP2)_Tra A hardware error
nsErr, occurred in the
*_P1(orP2)_ reception circuit of
OverRunErr, the Unit.
*_P1(orP2)_Fra
mingErr,
*_P1(orP2)_Par
A transmission error
ityErr
occurred due to
(Transmission
noise.
Error, Overrun
Error, Framing
Error, or Parity
Error) is TRUE.
Remedy
Delay the response from
the remote device.
Conduct a loopback test in
serial communications
mode to check the trans-
mission lines. If an error
occurs during the test,
replace the Unit.
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.
9-7
9