Real Time Request To Printer - CognitiveTPG A798 Programming Manual

74 Chapter 4: Programming Commands

Real time request to printer

GS sequence
ASCII GS ETX n
Hexadecimal 1D 03 n
29 3 n
Value of n: 1 = recover and restart
2 = recover and clear buffers
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.
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.
DLE sequence
DLE ENQ n
10 05 n
16 5 n
A798-PG00001D
Revision D 10/13