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9-11
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
9-3-2 No-protocol Mode
The serial commu-
nications mode is
set to No-protocol
Mode. --- --- --- A hardware error
occurred. Conduct a loopback
test in serial commu-
nications mode to
check the transmis-
sion lines. If an error
occurs during the
test, replace the Unit.
--- --- The cables are not
connected correctly.
The setting of the
2/4-wire switch for
the RS-422A/485
port does not match
the actual wiring.
The wiring of adapt-
ers 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 TRUE, but
*_P1(orP2)_SigCSSta (CS signal)
is FALSE. CTS control is set,
but the Remote
Unit's RTS (RS) sig-
nal 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 con-
trol.
• Input the RTS (RS)
signal from
Remote Unit to the
CTS (CS) signal of
the Local Unit and
use CTS control.
The RD @ indi-
cators flash
but communi-
cations are not
always possi-
ble.
A transmis-
sion 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 out-
side the permissible
range, or the bits
such as stop bits are
misaligned. Correct the System
Settings.
Revise the remote
device settings and
program (e.g., baud
rate, frame format)
Error conditions Confirmation of device
variable for CJ-series Unit, etc.
Cause Remedy
Serial
communications
mode
Indicator
display
Status and
other
conditions