Bronkhorst RS232 interface Manual do Utilizador descarregar pdf (Página 29)

BRONKHORST®

Page29RS232interface    9.17.027

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(FlowDDE)Parameternumbers:

Allparameterinformationisreferencedtotheparameternumber.Thisisauniquenumberforaparametertoavoid

redundancy.ThesenumbersareneededforDDEcommunicationonly.

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For communication with FLOW‐BUS throughother ways than DDE: directly via RS232 ASCII‐strings or via C‐libraries

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(DOS or Windows), use the parameter numbers for the FLOW‐BUS modules (in column FBnr of table Parameter

properties). Now you will always have to know the node‐address of the instrument on the FLOW‐BUS, the process

numberontheinstrumentandtheparameternumberontheinstrument.

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Process

 nr could be read from the table or has to be determined, when nothing is filled in. In most cases process

numberwillbe1.Node‐addressshouldbedeterminedalso.Thisisthenode‐addressoftheinstrumentontheFLOW‐

BUS. Newer RS232 protocols on Multibus instruments accept

node = 128. When sending messages to this node

address,themessagewillbealwaysaccepted,unregardingthenodeaddressoftheinstrumentonthebus.

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ItisimportanttoknowthatnotallparametersareavailableonallFLOW‐BUS/Multibusdevices.

Formoredetailsaboutparametersandtheiruseseealsodocumentnr.9.17.023fordescriptionof

digitalinstruments.IfyouhavetheprogramFlowDDE,youcanalsogetanoverviewofwhich

parametersareavailableonwhichdevices.

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APPENDIX1AND2WILLGIVEINFORMATIONABOUTPARAMETERS,THEIRPROPERTIESANDTHEIRPOSSIBLE

VALUES.

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Bronkhorst RS232 interface Manual do Utilizador Página 29