NCR NCR 5972 Manual

A SERVICE OF

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Chapter 4: Programming Set Up

FirmwareandsoftwarefunctiondescriptionsfortheNCR5972Retail

Displayarepresentedinthischapter.



Host/Retail Display Command Interface

TheRetailDisplayacceptstwotypesofdata:displaydataand

commanddata.Ifabytereceivedfromthehostisanycharacterexcept

theESC(0x1B)character,itisprocessedasacharacteranddisplayed

ontheRetailDisplay.IfanESCcharacter(0x1B)isreceived,the

subsequentbyte(s)is

processedasacommand.Ifthesubsequentbyte

isaninvalidcommanditisignored.IfanESCisreceived,butno

commandbyteisreceivedimmediately,thefirmwarewaitsforeverif

needbeandusesthenextreceivedbyte(s)tocompletethecommand.

Note: Eachcommandconsistsofatleast

twobytes.Thefirstbyte

(0x1B)isacommandidentifierindicatingthenextbyte(s)isa

commandbyte.Thecommandbytemaybefollowedbyparameter

ordatabytesdependingonthecommand.AlsonotethattheESC

charactercanbedisplayedbyusingtheDisplayESCCharacter

command.