Bronkhorst RS232 interface Bedienungsanleitung PDF herunterladen (Seite 17)

BRONKHORST®

Page17RS232interface    9.17.027

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3.7 SENDPARAMETERS

Towritetoadevicecommandcodes“01”and“02”mustbeused.“01”willgiveasresultastatusmessageforerror

checking.Command“02”willgivenoreplyfromthedevice.Inthetablebelowthetotalcommandlineisexplained.

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Sendingaparameter

Nr Byte Layout Description

0 :

startcharacter

1 Length

Messagelength

2 Node

Nodeaddress

3 01or02

Commandwrite,fortype01astatusmessage(00)willbereturned

4 Process cppppppp

c Processchained

p Processnumber

5

Parameter



cttppppp

c Parameterchained

t Parametertype

p Parameternumber (FBnr.)

6 Value1

Valueforalltypes.For‘strings’thisfieldcontainsthestringlength.

7 Value2

Valuefortype‘integer’,‘float’or‘long’.

8 Value3

Valuefortype‘float’or‘long’.

9 Value4

Valuefortype‘float’or‘long’.

X Valuex

Morevaluefieldsfollowfortype‘string’dependingonstringlength.Ifgiven

stringlengthiszero,thefinalfieldshouldalsocontainazero.

X+1 \r

CarriageReturn

X+2 \n

LineFeed

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3.8 REQUESTPARAMETER

Foreachrequestedparameteranindexnumbercanbegiven.Theansweringnodewillreturnthisindexnumberwith

therequestedparameter.Thiscanbeusedtocheckwhichparameterisreturnedwhenseveralparametersare

requested.

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Requestingaparameter

Nr Byte Layout Description

0 :startcharacter

1 LengthMessagelength

2 Node

Nodeaddress

3 04Commandread

4* Process cppppppp

c Processchained

p Processnumber

5* Parameter cttnnnnn

c Parameterchained

t Parametertype

n Parameterindex0…31

6 Process‐ppppppp

‐ Notused (useazero)

p Processnumber

7 Parameter‐ttppppp

‐ Notused (useazero)

t Typeparameter

t Parameternumber (FBnr.)

8 StringlengthForparametertype‘string’thisfieldcontainstheexpectedstringlength.

9 \rCarriageReturn

10 \nLineFeed

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dvise:

UsethesameprocessnameforNr4and6.Ifnoindexisrequired,fillintheFBnr.sothereturnmessage

willreturnwiththerequestedparameternumber.

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