Omron NT30 Operation Manual page 260

Responding to Displayed Error Messages
Message
(SCI)
Parity Error
Framing Error Framing Error
Overrun Error
Buffer Overflow B ffer Overflow
Time Out
NAK Received
(end code simultaneously
displayed)
Unit # Error
FCS Error
Checksum Error Checksum Error
S Display of Communication Errors
As shown below, communication errors are displayed in the center of the
screen, together with a classification indicating whether they are receive or
send errors.
Screen when an Error Has Occurred during Reception
Reception Error
Confirm
Screen when an Error Has Occurred during Sending
Transmit Error
Confirm
Cause
Communication parameters/
conditions set incorrectly.
Noise caused data corruption during
communication.
The connectors of the connecting
cable are not connected correctly.
The connectors of the connecting
cable have become disconnected.
The PC is stopped.
During transmission of one
command, a time lapse exceeding 5
seconds is detected.
Noise caused data corruption during
communication.
The unit # does not match that set in
the PC.
The PC is transmitting incorrect
data.
Noise caused data corruption during
communication.
The PC is transmitting incorrect
data.
Noise caused data corruption during
communication.
Error Description
SCI. Parity Error
SCI. Overflow Error
SCI. Framing Error
Buffer Overflow
Time Out
NAK Received
Unit # Error
FCS Error
Checksum Error
Error Description
Time Out
Remedy
Check whether the parity bit, data bit length, baud
rate, stop bit length, and flow control settings of the
PC match the settings of the NT30/30C.
Use a noise-resistant cable if communication occurs
in an environment with high levels of noise.
Reconnect the cable.
Reconnect the cable.
Make sure the PC is able to communicate with the
NT30/30C.
Check the cable connection.
Check the allocated bit and word settings.
If there is a possibility of noise, separate cables
from the source of the noise, and insert noise filters
in power lines. If the NT30/NT30C is used in an
environment with high levels of noise, use a
noise-resistant cable and make the cable length as
short as possible.
Set the PC unit No. to 0.
Check PC operation.
Use a noise-resistant cable if communication occurs
in an environment with high levels of noise.
Check PC operation.
Use a noise-resistant cable if communication occurs
in an environment with high levels of noise.
Section 6-2
251