NCR 7454 - Page 157

Chapter 6: NCR 7454 4x20 Customer Display 6-9
Set Diagnostic State
Format: 1B 04
Description: ThisstateisexclusivefromtheOnandLowPowerstates.This
commandcausesthefirmwaretodisplaythecurrentNCRpartnumber
andfirmwareversionofthedevice.Forexample,thecurrentpart
numberandfirmwareversionofthedeviceare008‐0221537and
V1.00.01)fortwoseconds
andthenstepthrougheachinstalled256‐
characterset(defaultanduserdefined)displayingonecharacterata
timeonall40displaypositionsatarateofaboutonecharacterper
second.Startwiththecurrentlyselectedcharactersetandthendisplay
allofthecharactersfromtheother
setsthesameway.Thiscontinues
untiloneoftheotherstatecommandsisperformed.Priordisplaydata
issavedandcanberestoredbesendingtheTurnOn(state3)com‐
mand.
Set Display State On
Format: 1B 05
Description: Thisstateisusedfornormalrun‐timeconditions.Thisoperation 
instructsthefirmwaretoleaveoneoftheotherstatesandbegin
performingnormalrefreshoperations.Theremaybeaslightdelay
beforetheVFDreachesthespecifiedbrightnesssettingwhenexiting
theLowPowerState.Thisdelay
shouldnotexceed1secondfromthe
timethecommandisreceiveduntilthetimetheVFDreachesthe
specifiedbrightness.
Highestpriorityisgiventorefresh operationsandalowerpriorityis
giventohostcommunications.Hostcommunicationsstillwork,butifa
largeamountofdataisto
beprogrammedinaveryshorttimeframe,it
wouldworkfasteriftheBlankStatewasprogrammedpriortothe
informationtransfer.