Real-time request to printer

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	GS sequence		DLE sequence
ASCII	GS ETX n		DLE ENQ n
Hexadecimal	1D 03 n		10 05 n
	29 3 n		16 5 n
Value of n:	1	= recover and restart
	2	= recover and clear buffers
	3	= cancel slip wait

The printer responds to a request from the host specified by n. This command includes two sequences: GS and DLE. The operations performed depend on the value of n, according to the following parameters.

n = 1

Restarts printing from the beginning of the line where an error occurred, after recovering from the error. Print settings that are normally preserved from line to line, such as character height and width, are still preserved with this command. This sequence is ignored except when the printer is busy due to an error condition.

This command will attempt recovery from a knife error. Other errors associated with the receipt, such as paper out or printhead overheating, can be recovered from only by clearing the specific condition, such as loading paper or letting the printhead cool down.

n = 2

Recovers from an error after clearing the receive and print buffers. Print settings that are normally preserved from line to line, such as character height and width, are still preserved with this command. This sequence is ignored except when the printer is busy due to an error condition.

The same error recovery possibilities exist as for n = 1.

n = 3

Cancels the slip waiting status. This sequence is ignored except when the printer is waiting for a slip to be inserted.

When slip waiting is canceled, the receive and print buffers are cleared and the receipt is selected. When printing on the slip is to continue, the slip must be selected again.

Exceptions

The command is ignored if n is out of range

An application using the DLE sequence must send ENQ within 100 milliseconds of DLE or the printer will misinterpret the DLE and execute a Clear Printer command. Avoid this possibility by using the 1D 03 n sequence that is handled exactly the same as 10 05 n.

A776 (B780) Programming Guide

A776-PG00001 C 12/09

B780, A776 specifications

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Cognitive Solutions B780, A776 manual Real-time request to printer, Programming commands

Models: B780 A776

94 Chapter 5: Programming commands