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9-13
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-3 T
rou
b
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ting
9
9-3-2 No-protocol Mode
The serial commu-
nications mode is
set to No-protocol
Mode. --- --- Overrun Error
*_P1(orP2)_OverRunErr is TRUE.
The reception buffer
received more than
259 bytes of data
before the SerialRcv
or SerialRcvNo-
Clear instruction was
executed. Cycle the power or
restart the Unit and
clear the reception
buffer.
The Overrun Error
Flag is turned to
FALSE when the
reception buffer is
cleared.
--- The Reception Overflow Flag is
ON.
*_P1(orP2)_NopRcvOvfSta is
TRUE.
After reception was
completed (after the
Reception Com-
pleted Flag turned
ON), further data
was received (1 byte
or more). After data reception
is completed (i.e.,
after the Reception
Completed Flag
changes to TRUE),
execute the Serial-
Rcv or SerialRcvNo-
Clear instruction
again.
--- The Reception Completed Flag is
OFF.
*_P1(orP2)_NopRcvCompleteSta
is FALSE.
Reception for the
SerialRcv or Serial-
RcvNoClear instruc-
tion was not
completed. One of
the following is the
cause. ---
The start
code/end code
setting is incor-
rect. Revise the settings
for the Start
Code/End Code in
*_P1(orP2)_NopStar
tCodeCfg (No-proto-
col Start Code),
*_P1(orP2)_NopEnd
CodeCfg (No-proto-
col End Code).
No data was
received.
The specified
number of data
bytes was not
received. Revise the specified
number of receive
data bytes in
*_P1(orP2)_NopRcv
DatSzCfg (Number
of Receive Data
Bytes in No-protocol
Mode).
Overrun error
(The reception
buffer received
more than 259
bytes of data
before the Serial-
Rcv or Serial-
RcvNoClear
instruction was
executed.) Cycle the power or
restart the Unit to
clear the reception
buffer.
The Overrun Error
Flag is turned to
FALSE when the
reception buffer is
cleared.
--- --- A hardware error
occurred in the
reception circuit of
the Unit. 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.
Error conditions Confirmation of device
variable for CJ-series Unit, etc.
Cause Remedy
Serial
communications
mode
Indicator
display
Status and
other
conditions