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9 Troubleshooting and Maintenance
9-4
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-3 Troubleshooting
Responses Returned to the Command Source
z
Conversion Failure
9-3-1 Serial Gateway (Serial Gateway or Protocol Macro Mode)
Error conditions Cause Remedy
Unit status Serial
communications
mode
Indicator
display
Command
end code
sent to
command
source
Confirmation of
device variable
for CJ-series
Unit, etc.
The Unit can-
not convert the
received (via
CPU bus)
command into
any of the pro-
tocols. The serial commu-
nications mode is
set to a mode
other than Serial
Gateway Mode or
Protocol Macro
Mode. --- Bits 12 to 15
(Serial communi-
cations mode) of
*_P1(orP2)_SysS
etSta are set to a
value other than 9
hex or 6 hex. Serial commu-
nications
mode is not
set correctly. Set bits 08 to 11 (Serial
communications mode) of
*_P1(orP2)_PortCfg either
to 9 hex (Serial Gateway
Mode) or 6 hex (Protocol
Macro Mode).
NT Link, loop-
back test, or
No-protocol
Mode 0401 hex
(undefined
command) 2 hex, F hex, or 3
hex Serial Gate-
way com-
mand was
sent.
Host Link --- 0205 hex
(response tim-
eout), etc. 0 hex or 5 hex
The Unit can-
not convert the
received (via
CPU bus)
command into
any of the pro-
tocols. The serial commu-
nications mode is
set to Serial Gate-
way or Protocol
Macro Mode. The SD @ indi-
cators do not
flash at all.
(Communica-
tions were not
electrically
established.)
0205 hex
(response tim-
eout), etc. --- A hardware
error occurred. Conduct a loopback test in
LoopbackTest Mode to
check the transmission
lines. If an error occurs dur-
ing the test, replace the
Unit.
The SD @ indi-
cators do not
flash.
0202 hex (no
Unit)
or
0401 hex
(undefined
command)
--- The com-
mand destina-
tion address is
not specified
correctly. Correct the command desti-
nation address specifica-
tion, and then resend the
message.
The serial commu-
nications mode is
set to Serial Gate-
way or Protocol
Macro Mode. The SD @ indi-
cators do not
flash at all.
2605 hex (ser-
vice executing) --- The serial
communica-
tions port
received a
sixth com-
mand when
five com-
mands are still
waiting for pro-
cessing. Add retry processing on the
command source for
response code 2605 hex.