Bronkhorst FlowDDE Manuel d'utilisateur télécharger pdf (Page 18)

BRONKHORST®

6 FLOWDDE TECHNICAL DETAILS

In the following diagram, the communication from a DDE client to the instrument is schematically drawn. The

FlowDDE application makes use of the Flowb32.dll and the parameter database.

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, sends these messages and receives and interprets the answers from the instruments.

Included in the

FlowDDE installation

FlowDDE application

DDE client

Flowb32.dll

RS232/FLOW-BUS interface

or multibus instrument

FlowDDE

parameter database

DDE messages

ProPar (binary)

calls to DLL

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Bronkhorst FlowDDE Manuel d'utilisateur Page 18