NCR 7454 - Disable Cursor; Set Screen Save Blank; Set Screen Save Walk

Chapter 6: NCR 7454 4x20 Customer Display 6-11
Disable Cursor
Format: 1B 08
Description: Thiscommandcausesthecursortobeturnedoff.Thisisthedefault
stateforthecursorafterpower‐up.Adisabledcursordoesnot
overwriteadisplayedcharacter.
Set Screen Save Blank
Format: 1B 09
Description: Thiscommandisintendedtopreservethelifeofthedisplayhardware
unit.Thefirmwaremaintainsafive‐minutetimerthattriggersthis
feature.TheScreenSavefeaturecanbedisabledthroughacommand
fromthehostsoftware.Whenthefeatureisnotdisabled,twospecific
optionsexist.The
SetScreenSaveBlankoperationcausesthedisplayto
goblankwhenthetimerexpires.Whenthefirmwarereceivesthe
commandcode,theScreenSavemodeiscanceledandthefive‐minute
timerisestablished.ScreenSave BlankremovespowerfromtheRetail
VFDanddoesnotrefreshthedisplay
inthesamemannerastheSet
LowPowerOncommand.Atpowerup,thetimerisestablishedatfive
minutesandScreenSaveBlankisestablishedasadefault.Thefive
minutetimerisnotresetbyanyinvalidorincorrectcommand.
Set Screen Save Walk
Format: 1B 0A
Description: Thiscommandcausesthevisibledisplaytowalkrighttoleftwhenthe
ScreenSavetimerexpires(fiveminutes).Thecharactersonthedisplay 
willappeartowalkacrossthecorrespondingdisplayrowfromrightto
left.Thefourlinesinthe4x20Displaywillwalkinparallelcompletely

offtheleftsideofthedisplayandthenthefourlineswillappearto
comebackfromtheright.Ifthedisplayisspacefilled,thennoeffectis
perceivedeventhoughthewalkingistakingplace.TheScreenSave
Blankmodeisthedefaultmodeafterpowerup.