Bronkhorst RS232 interface - Manual (Page 29)

BRONKHORST ®
Page 29 RS232 interface 9.17.027
(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.
For communication with FLOW‐BUS through other ways than DDE: directly via RS232 ASCII‐strings or via C‐libraries
(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.
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.
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.
APPENDIX 1 AND 2 WILL GIVE INFORMATION ABOUT PARAMETERS, THEIR PROPERTIES AND THEIR POSSIBLE
VALUES.