Bronkhorst Multibus Manual do Utilizador descarregar pdf (Página 13)

BRONKHORST®

Page 13 Operational instructions for digital multibus instruments 9.17.023

These programs are on the support CD or can be downloaded from:

http://www.bronkhorst.com/en/products/accessories/software_tools/

End-users are also free to use their own software using either:

FlowDDE : DDE-server for data exchange with Microsoft Windows applications

FLOWB32.DLL : Dynamic Link Library for Microsoft Windows applications

RS232 interface : Protocol for instructions with ASCII HEX or Binary telegrams

3.3 PARAMETER USE

In general each parameter has its own properties, like data-type, size, reading/writing allowance, security.

Parameters can be protected in general:

• Parameters used for operation of instruments are not secured (read / write is allowed).

(e.g..: measure, setpoint, control mode, setpoint slope, fluid number, alarm and counter)

• Parameter for settings and configuration are secured (reading is allowed/ writing is not allowed).

(e.g..: calibration settings, controller settings, identification, network/field bus settings)

Parameters for settings are secured. They can be read-out, but can not be changed without knowledge of special key-

parameters and knowledge of the instrument.

Reading/changing parameter values via FlowDDE offers the user a different interface to the instrument. Besides the

server name: ‘FlowDDE’ or ‘FlowDDE2’ there is only need of:

• topic, used for channel number: ‘C(X)’ (x = channel number)

• item, used for parameter number: ‘P(Y)’ (y = parameter number)

A DDE parameter number is a unique number in a special FlowDDE instruments/parameter database and not the

same as the parameter number from the process on an instrument. Node address and process number will be

translated by FlowDDE to a channel number.

When not using FlowDDE for communication with the instrument, each parameter value needs:

• node address of instrument on FLOW-BUS

• process number on instrument

• parameter number on instrument

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Bronkhorst Multibus Manual do Utilizador Página 13