Omron NT31 NT31C manual Parity error at serial port a, Probable Causes and Remedies Receive Errors

Responding to Displayed Error Messages Section 7-2

Example:

Parity error at serial port A

Probable Causes and Remedies

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

The remedies to take in accordance with the displayed cause are indicated in the table below.

Error Details	Displayed Probable Cause	Remedy
Parity Error	Communication parameters/	Check if the settings at the host for parity bit, frame
Framing Error	conditions set incorrectly.	length, communications speed, stop bit length and
		flow control agree with those at the NT31/NT31C.
Over-run Error
	The connecting cables are not	Check the communication cable connection and
	connected correctly.	perform a conductivity test. If there is a fault,
		replace the cable. For details on communication
		cables, refer to Section 4 Connecting to the Host
		from the RS-232C Port, and Section 5 Connecting
		to the Host from the RS-422A/485 Port.
	Noise caused data corruption during	Carry out grounding work in accordance with the
	communication.	conditions by referring to 3-1-4 Grounding, page 34.
FCS (Check Sum) Error	Noise caused data corruption during	Carry out grounding work in accordance with the
	communication.	conditions by referring to 3-1-4 Grounding, page 34.
	The PC is transmitting incorrect	Check the operation at the host side.
	data.

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