Omron NT631C manual Data Format, About RS/CS Control, Stx, Etx

Connecting a Bar Code Reader		Section 3-4
	Item	Possible Settings
	Preamble	STX
	Postamble	ETX
	RS/CS control	Available
	Communications protocol	No-protocol mode
	Transmission of number of bar code label digits	Transmission prohibited
	Transmission of ID characters	Transmission prohibited
	Bar code types	Multi-reading (all types can be
		read)
	Trigger switch setting	Automatic reading mode

About RS/CS Control

During bar code reading, the NT631/NT631C performs RS/CS control. When the Input Method setting of the NT631/NT631C is set to Auto, the RS signal is turned OFF, prohibiting the next input, until the read data has been sent to the host as notification.

Because of this, when the Auto setting is made, the next input is not possible until the data has been sent to the host as notification.

However, when the setting is Auto and the RS/CS signals of the cable are shorted, RS/CS control is ineffective. Consequently, data input from the bar code reader to the NT631/NT631C is updated regardless of whether or not the data is sent to the host as notification.

For details, refer to the instruction manual for the bar code reader used.

3-4-3 Data Format

The data format for communications when using the bar code input function of the NT631/NT631C is shown below.

STX Data Data

(02H)

Data	ETX
	(03H)

The characters which are effective as data are hexadecimal codes from 20 to 7FH, and the maximum data length is 40 bytes.

Data which does not follow the data format described above is invalidated and discarded.

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