NCR RealScan 7837-3000 - Concatenation of Multiple Commands; Responses

Chapter 10: Serial Programming Commands 10-3
:Name: Field
Thiscomm equeryinformationfromthescanner.
stothe
getable
d.Inthiscase,theSubTag
bythe
aqueryisusedinplaceofaSubTagfield,thequeryappliesonly 
subsetofcommandsavailablethatmatchtheTagfield.Inthis
the


Concatenation of Multiple Commands
beissuedwithinonePrefix/Storagesequence.
to
fieldsoftheadditional
commandareissued.Iftheadditionalcommandrequiresadifferent
edfrompreviouscommandsbya
Responses
Thedevicerespondstoserialcommandswith ofthreeresponses:
ACK Indicates a go processed.
Usage (Optional)
andreturnsth
Tag Field Usage
Whenaqueryisusedinplace ofaTagfield,thequeryapplie
entiresetofcommandsavailablefortheparticularstora
indicatedbytheStoragefieldofthecomman
andData
fieldsshouldnotbeusedbecausetheyareignored
device.
SubTag Field Usage
When
tothe
case,theDatafieldshouldnotbeusedbecauseit
isignoredby
device.
Data Field Usage
Whenaqueryisusedinplace oftheDatafield,thequeryappliesonly
tothespecificcommandidentifiedbytheTagandSubTagfields.
Multiplecommandscan
OnlytheTag,SubTag,andDatafieldsmustberepeatedforeach
commandinthesequence.Ifadditionalcommandsaretobeapplied
thesameTag,thenthenewcommandsequenceisseparatedwitha
comma(,)andonlytheSubTag
andData
Tagfield,thecommandisseparat
semicolon(;).
one
od command which has been