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BRONKHORST FlowDDE - FLOWDDE TECHNICAL DETAILS; Communication Architecture

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BRONKHORST®
Page18FlowDDE  9.17.067
6 FLOWDDETECHNICALDETAILS
In the following diagram, the communication from a DDE client to the instrument is schematically drawn. The
FlowDDEapplicationmakesuseoftheFlowb32.dllandtheparameterdatabase.
A DDE client communicates to FlowDDE using DDE messages. FlowDDE uses the parameter database for parameter
information and the Flowb32.dll
to perform the low level communication to the FLOW‐BUS. The Flowb32.dll has
methods to easily send or request a parameter value to a certain node, process and parameter and to get the
answers. From the calls to these methods, it constructs the required FLOW‐BUS messages in the binary ProPar
protocol,sendsthesemessagesandreceivesandinterpretstheanswersfromtheinstruments.
Includedinthe
FlowDDEinstallation
FlowDDEapplication
DDEclient
Flowb32.dll
RS232/FLOW‐BUSinterface
ormultibusinstrument
FlowDDE
parameterdatabase
DDEmessages
ProPar(binary)
callstoDLL

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