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9 Troubleshooting and Maintenance
9-14
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
z
Transmission Failure (SerialSend Instruction)
Error conditions Confirmation of device variable
for CJ-series Unit, etc.
Cause Remedy
Serial
communications
mode
Indicator
display
Status
and other
conditions
Serial communica-
tions mode is No-
protocol Mode. --- --- Bits 12 to 15 (Serial communica-
tions mode) of
*P1(orP2)_SysSetSta are set to a
value other than 3 hex. The serial commu-
nications mode is
not set correctly. ---
Protocol Macro
Mode, Serial
Gateway
Mode, Mod-
bus-RTU Slave
Mode or Loop-
back Test
Mode --- --- During execu-
tion of the Seri-
alSend
instruction Command end
code such as
0401 hex (unde-
fined command)
is returned. The serial commu-
nications mode is
not set correctly. Set bits 08 to 11
(Serial communica-
tions mode) of
*_P1(orP2)_PortCfg
to 3 hex (No-protocol
Mode).
The serial commu-
nications mode is
set to No-protocol
Mode. The SD @ indi-
cators do not
flash at all.
(Communica-
tions were not
electrically
established.)
--- --- A hardware error
occurred. Set the serial commu-
nications mode to
Loopback Test Mode
and check the trans-
mission lines. If an
error occurs during
the test, replace the
Unit.
--- --- The cables are not
connected cor-
rectly.
The setting of the
2/4-wire switch for
the RS-422A/485
port does not
match the actual
wiring.
The wiring of
adapters such as
the NT-AL001 is
incorrect.
Check the wiring.
Check the setting of
the 2/4-wire switch.
Wire all nodes by
using the 4-wire
method.
--- *_P1(orP2)_HlkCTSCtlCfg (CTS
Control) is ON, but
*_P1(orP2)_SigCSSta (CS signal)
is FALSE. CTS control is set,
but the Remote
Unit's RTS (RS)
signal is not input
in the Local Unit's
CTS (CS) signal. Perform either of the
following:
Loop the RTS (RS)-
CTS (CS) signals of
the Local Unit.
Disable CTS control.
Input the RTS (RS)
signal from the
Remote Unit to the
CTS (CS) signal of
the Local Unit and
use CTS control.
The SD @ indi-
cators flash but
communica-
tions are not
always possi-
ble.
A transmission
error occurred. *_P1(orP2)_TransErr (Transmis-
sion error) or
*_P1(orP2)_OverRunErr (Overrun
Error) is TRUE. The settings in the
System Settings
such as baud rate
and frame format
do not match those
of the remote
device. The baud
rate is outside the
permissible range,
or the bits such as
stop bits are mis-
aligned. Correct the system
settings.
Revise the remote
device settings and
program (e.g., baud
rate, frame format)