Bronkhorst Multibus - Manual (Page 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 P
ARAMETER 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