Omron NT631C manual Communications Errors and Their Remedies, Parity error at serial port a

Responding to Displayed Error Messages			Section 7-2
Message		Cause	Remedy
Unable to download System Pro-	-	A communications error	Select Download System Program and download
gram.		occurred during downloading of	the system program again (6-5-2 Clearing/Install-
		the system program.	ing the System Program, page 145)
	-	Illegal data has been written	Also refer to 7-2-3 Errors Occurring on Screen
		into the screen data memory.	Data Initialization and Transmission (page 232),
	- Hardware fault, or flash memory		and take the corrective action described for tool
		(memory for storing the system	transmission errors.
		program) has reached its life.	If this does not solve the problem, contact your
			OMRON service center.
Unable to write System Settings.	Hardware fault, or flash memory		If the same message is displayed on repeating
	(memory for storing the system		writing of system settings several times, contact
	program) has reached its life.		your OMRON service center.
			If writing is normally terminated after the error
			message was once displayed, the Memory
			Switch setting for system program may have been
			altered. In such a case, check and reset the set-
			ting in the Memory Switch menu of the Mainte-
			nance mode.
Unable to erase Screen Data.	Hardware fault, or flash memory		If the same message is displayed on repeating
	(memory for storing the system		screen data deletion several times, contact your
	program) has reached its life.		OMRON service center.

7-2-5 Communications Errors and Their Remedies

This section describes the errors relating to communications that can occur during operation, and their remedies.

Operation When a

Communications Error

Occurs

Operation When

Communications Errors

Occur

Display of Communications Errors

When a communications error occurs, the error message is displayed at the NT631/NT631C, and the buzzer sounds, provided the setting made for Buzzer Sound in the System 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 messages are displayed even if the setting is ON).

When an error message is displayed, after removing the cause of the error, press the OK touch switch displayed on the screen. The NT631/NT631C will return to the screen that was displayed before the error occurred, and opera- tion will restart.

For communications 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

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