Specifications

Chapter 8: NCR 7401 7890/7892 Scanner Differences 8-5
Programming the 7401 Scanner Through the RS-232 Interface
Aswiththe7890and7892,the7401Scannercanbeprogrammed
throughtheRS‐232interface.The7890,7892,and7401Scannershavea
Programcommand(33h 45h)whichpermitsyoutosendthetag
informationthroughthecommunicationsport(COM1onthe7401).
Sendthesamesequencesthatwould
beinputusingthetags.Seethe
NCRScanner/ScaleInterfaceProgrammerʹsGuideformoreinformation.
TheDisablecommandmustbesenttothescannerbeforetheProgram
commandissent.
Thedefaultforthemessageformatisthesameforthe7401Scanneras
itisforthe7890
and7892Scanners.ThereisnoStartsentinel,andno
BCCisused.ThecommandisissuedfollowedbytheEndsentinel
whichisanETX(EndofText)character(03h).Forexample,theStart
commandisissuedas33h 38h 03horASCII:38ETX.