Omron NT21 Series, Reference Manual

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6-2 Section Responding to Displayed Error Messages
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6-2-5 Communication Errors and Their Remedies
This section describes the errors relating to communication that can occur dur-
ing operation, and their remedies.
When a communication error occurs, the error message is displayed at the PT,
and the buzzer sounds, provided the setting made for Buzzer Sound in the Sys-
tem Menu is other than OFF. An error message is displayed provided the setting
for the Comm. Auto-Return memory switch is not ON (note that some error mes-
sages are displayed even if the setting is ON).
When an error message is displayed, press the OK touch switch displayed on
the screen. The PT will return to the screen that was displayed before the error
occurred, and operation will restart.
For communication errors, the name of the port at which the error occurred, the
error classification (send or receive error), the details of the error, the probable
cause, and the remedy, are displayed as shown below.
Example: Parity error at serial port A
Receive Errors
The following errors can occur when receiving data.
•
Parity error
•
Framing error
•
Overrun error
•
FCS (sum value) error
•
Time out error
•
Data over flow error
•
PC unit No. error (host link only)
•
NAK received (in the case of the host link, the end code is also displayed)
•
Undefined command error
Send Errors
The following errors can occur when receiving data.
•
Time out error
•
Data over flow error
Operation When a
Communication Error
Occurs
Operation When
Communication Errors
Occur
Display of
Communication Errors
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