HP Value Serial/USB Receipt Printer II Manual do Utilizador descarregar pdf (Página 84)

Chapter 3: Programming Commands84

Unsolicited status mode

Select or cancel unsolicited status mode (USM)

ASCII: GS a n

Hexadecimal: 1D 61 n

Decimal: 29 97 n

Value of n: 0 turns mode o; any non-zero value turns mode on

Default: 0 (USM disabled)

Enablesordisablesautomaticreturnof4statusbyteswheneveroneormoreofthelistedchangesoccurs.Thiscommand

isabatchmodecommand;thatis,itisprocessedafterallpriordataintheinputbufferhasbeenprocessed.Theremaybe

atimelagbetweentheprinterreceivingthiscommandandenablingunsolicitedstatusmode(USM),dependingonthe

pending input buffer contents.

Ifanimmediatereturnofprinterstatusisdesired,thenanyoftheotherstatuscommandsshouldbeissuedfollowingthis

command.Oncethismodeisactivated,theprinterautomaticallytransmits4statusbyteswheneveranyoftheconditions

change.IfanRS-232Cconnectionwithhardwareowcontrolisused,allfourstatusbyteswillbetransmittedwithout

checkingDSR.

ThiscommandisaPOSversionofgeneralprinterunsolicitedstatusfunctions;itusesthesamecommandcodeasolder

versionsofthePOScommand,“automaticstatusback(ASB)”buthasthefollowingdifferences:

• Theparameternisanon/offswitch;itdoesnotselecttriggersubset

• Thereisnoimmediatereturnwhenthismodeisturnedon

• All4statusbytesarealwaysreturned

AchangeinanyofthefollowingconditionswilltriggertheUSMresponse:

• CashDrawer

• ReceiptCover

• KnifeError

• Out-of-RangePrintheadTemperature

• Out-of-RangeVoltage

• PaperExhaustStatus

Related information

WhenUnsolicitedStatusModeisenabledusingthiscommand,thestatustransmittedbyothercommandsandtheUSM

statusaredifferentiatedaccordingtotheinformationfoundinRecognizingDatafromtheprinter,whichfollowstheUSM

return description.

Thestatusbytestobetransmittedaredescribedinthefollowingfourtables.

Byte 1 = printer information

Byte 2 = error information

Byte 3 = paper sensor information

Byte 4 = paper sensor information

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 154 155

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HP Value Serial/USB Receipt Printer II Manual do Utilizador Página 84