NCR RealPOS 70 - Chapter 11: APA Customer Display Interface

Chapter 11: APA Customer Display Interface
Introduction
TheAPA(AllPointsAddressable)CustomerDisplayconsistsofa128
by64dotmatrixgraphicVacuumFluorescentDisplay(VFD),an
RS‐232serialinterface,drivercircuitry,DCtoDC/ACconverter,anda
charactergenerator.Themoduleiscapableofdisplaying64luminance
levelsand4grayscalelevels.
General Specifications
Item Value
NumberofDots 128x64
DotHeight 0.5mm
DotWidth 0.5mm
DotPitch 0.65mm
PatternWidth 83.05mm
PatternHeight 41.45mm
ColorofIllumination Green(x=0.235,y=0.405)
Luminance 250Cd/m2(73fL)(Minimum),
500cd/m2(146fL)(Typical)
Serial Communication Interface
ThemodulereceivescommandsanddatafromthehostoveranRS‐232
singlewireserialinterfaceframedwithonestartbit,8databits,and
onestopbit.Thebaudrateis115.2Kor9600ifJP1isplacedonthePCB.