CognitiveTPG A798 Instruction Manual download pdf (Page 77)

Chapter 4: Programming Commands 77

Revision C 12/09

A798-PG00001C

Real time request to printer

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 buers

The printer responds to a request from the host specied 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 specic 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.

Exceptions

The command is ignored if n is out of range.

An application using DLE (0x10) 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 ID 03 n sequence, that is handled exactly

the same as 10 05 n.

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CognitiveTPG A798 Instruction Manual Page 77