Banner A-GAGE High-Resolution MINI-ARRAY Series Manuel d'utilisateur télécharger pdf (Page 34)

P/N64118rev.B

Appendix A: Data Transmission

Banner Engineering Corp. •Minneapolis,U.S.A.

www.bannerengineering.com•Tel:763.544.3164

Appendix A: Data Transmission

A.1 Host Mode Command String

Asdiscussedinsection5.3.2ofthismanual,thecontrolmodulehasthreecontrol

modeoptions:continuous,gate,andhost.Hostmoderequiresaserialtransmission

stringfromaseparatedevice,typicallyaPCorprocesscontroller.Theserial

transmissionmediumcanbeeitherRS-485orRS-232.

WhenHostcontrolmodeisselected,thehostprocesscontrollerinitiatesscansusinga

commandstring.Thecommandstringisathree-bytemessage,consistingof:

•Controlbytewithdecimalvalue248,

•ControllerID(theidentificationofaspecificcontrolmoduleonthestring,indicated

byoneof15ASCIIlettersAthroughO,andspecifiedinthePSF),and

•Scaninitiationbyte(ASCIIletterS).

Thecommandstringisfurtherdefinedasfollows:

/*the below C code will define an array called msg that will contain the Host Scan Command */

unsigned char msg[3]; /*declare three byte unsigned character array using C language */

msg[0]=248; /*control byte */

msg[1]=65; /*assume the controller ID is the letter A */

msg[2]=83; /*assume initiation byte which is the ASCII letter S */

Thehosttransmitsthisthree-bytemessageatthedefinedbaudrate.Theformatisone

startbit,onestopbit,evenparity,andeightdatabits.Whenthecontrolmodule

receivesthismessage,itinitiatesascan(assumingHostmodeisselected)andthen

updatesitsoutputsasrequired.ThecontrolmodulethenwaitsforthenextHost

Commandmessagebeforeinitiatinganotherscan.

A.2 Serial Data Format and Header String

Theprogrammedmeasurementmodeormodesdeterminethetypeofinformationthat

isseriallytransmitted.ForexampleifMeas1issetforFBBandMeas2issetforLBB,

thenthedatatransmittedtothehostcontainsthevaluesofthefirstandlastbeam

blocked.TheAllmeasurementmodeprovidesthestatusofallbeamstothehost.

Inadditiontomeasurementmodeinformation,thedatatransmissionalsocontainsa

two-bytestartstringandaterminationbyte.Thestartstringconsistsofafirstbytethat

doesnotchange,followedbythecontrollerID.Thefirstbytevalueisahex1Cor28

decimal.Attheendofthestring,thecontrolmodulewillplaceaterminationbyte.The

terminationbyeistheASCIIcharacterforalinefeed(hexvalue0A).Thesethreebytes

collectivelyarecalledtheSerialHeaderstring.

Figure A-1. Serial Transmission options

(PSF Configuration screen)

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 40

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Banner A-GAGE High-Resolution MINI-ARRAY Series Manuel d'utilisateur Page 34