Filter
Top Products
FS-8700-49_Data_Aire_DAP Page 12 of 48
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web:www.FieldServer.com
Tel: (408) 262-2299 Fax: (408) 262-2269 Toll_Free: 888-509-1970 email: support@FieldServer.com
4.4.6. Map Descriptor: Example 3 – Writing multiple points using one message.
Additional information is provided in Appendix B
// Client Side Map Descriptors
Map Descriptors
Map_Descriptor_Name, Data_Array_Name, Data_Array_Offset, Function, Node_name, Address, Length, DA_Field, DA_Assoc, Scan_Interval
Write_Map Descriptor_1, DA_SETPOINTS, 0, WRBC, Unit1, 0, 1, nom_h_setpt, 2, 120s
Write_Map Descriptor_1, DA_SETPOINTS, 1, passive, Unit1, 0, 1, t_setpt, 2,
A 'Write' and a passive to the same node. This write
will update two fields, the nom_h_setpt and the t_setpt.
The write Map Descriptor. must precede the passive.
For a Dart, use wrbx instead of wrbc.
Associate the passive Map Descriptor to the active (wrbc) Map Descriptor. In
this way the driver will use only one message to write to the device. The
message will be built using both Map Descriptors. This method reduces the
communication load.
The association is made using the DA_Assoc parameter. Use unique positive
integers. Omitting the DA_Assoc parameter when using ‘passive’ Map
Descriptors will produce ambiguous results.