HP Value Serial/USB Receipt Printer II Manual de usuario descargar pdf (Pagina 68)

Chapter 3: Programming Commands68

Status

Status command introduction

TheA798IIhasthreemethodsofprovidingstatustotheapplication.Thesemethodsarethroughbatchstatuscommands,

realtimestatuscommandsandunsolicitedstatusmode.Anapplicationmayuseoneormoreofthesemethodsto

understand the current status of the printer. A brief description of each of these methods follows.

Batch status commands–Thesecommandsaresenttotheprinterandstoredintheprinter’sbuffer.Oncetheprinterhas

processedallthepreviouscommandsthesecommandsareprocessedandtheproperstatusisreturnedtotheapplication.In

theeventaconditioncausestheprintertogoBUSY,itstopsprocessingcommandsfromtheprinterbuffer.Ifabatchstatus

commandremainedinthebufferduringthisbusycondition,itwouldnotbeprocessed.Infact,nobatchcommandsare

processed while the printer is in this state.

Real-time commands–Thesecommandsaresenttotheprinterbuffer.Periodically,whentheprinterhastime,itscans

theinputbufferlookingforthesecommands.Whenfoundbytheprinter,thesecommandsareprocessedimmediately.

Thisgivestheapplicationtheabilitytoquerytheprinterwhenitisinabusystateinordertocorrectwhateverfaulthas

occurred.

Automatic status back or Unsolicited status mode–Thismechanismallowstheapplicationdevelopertoprogramthe

printertoautomaticallyrespondwithafourbytestatuswhencertainconditionsintheprinterchange.

Pleaseseethesubsequentsectionsforamoredetaileddescriptionofthesestatuscommands.Attheendofthisstatus

commandssectionisapageentitled“Recognizingdatafromtheprinter”.Thisdescribeshowtointerpretwhatcommand

orsetting(inthecaseofunsolicitedstatusmode)triggeredaresponsefromtheprinter.

Batch mode

ForRS-232Cprinters,thesecommandsenabletheprintertocommunicatewiththehostcomputerfollowingtheselected

handshakingprotocol,eitherDTR/DSRorXON/XOFF.Theyarestoredintheprinter’sdatabufferastheyarereceived,

andarehandledbythermwareintheorderinwhichtheyarereceived.

Whenafaultoccurs,theprinterwillgobusyattheRS-232Cinterfaceandnotrespondtoanyofthebatchmodeprinter

statuscommands.Ifthefaultcausingthebusyconditioncanbecleared,suchasbyloadingpaper,orlettingthethermal

printheadcooldown,theprinterwillresumeprocessingthedatainitsreceivebuffer.

Transmit peripheral device status (RS-232C printers only)

ASCII ESC u 0

Hexadecimal 1B 75 0

Decimal 27 117 0

Value of returned byte:

Bit 0 Bit 1

1 = Drawer 1 Closed 1 = Drawer 2 Closed

0 = Drawer 1 Open 0 = Drawer 2 Open

Bits 2–7 are not used.

Transmitscurrentstatusofthecashdrawers.Onebyteissenttothehostcomputer.InDTR/DSRprotocol,theprinterwaits

forDSR=SPACE.Ifadrawerisnotconnected,thestatuswillindicateitisclosed.

Exceptions

UnliketheA793,thathadadedicatedconnectorandresultantdedicatedstatusreportingforeachcashdrawer,theA798II

hasasingleconnectorthatsharesdatareportingfromeithercashdrawer.Wheneithercashdrawerisopen,anopenstatus

isreportedbytheprinter.

Related information

InLEGACYemulation,thiscommandisignored.

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HP Value Serial/USB Receipt Printer II Manual de usuario Pagina 68

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