HP Value Serial/USB Receipt Printer II Manual de usuario descargar pdf (Pagina 79)

Chapter 3: Programming Commands 79

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.

Thiscommandcanbedisabledusing1F7A.Ifinpagemode,theprinterissetbacktostandardmode,causingvaluesset

by1B57tobechangedbacktodefault.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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HP Value Serial/USB Receipt Printer II Manual de usuario Pagina 79