McQuay Micro Tech Open Protocol Driver Manual Page 30 of 35 FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldServer.com
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Appendix A.7. Advanced Map Descriptor Example 3 – Controlling Bytes per Field – Writing This example writes to a McQuay device starting at address 4096 (= 0x1000) to 4097incl. The value written to each address location is based on
a single value extracted from the FieldServer’s Data Arrays.
The value v0 = (value_extracted_from_DA) AND 0xff
The value v1 = (value_extracted_from_DA shift right by 8) AND 0xff
The driver writes value v0 to address 4096.
The driver writes value v1 to address 4097.
Map_Descriptor_Name
,Data_Array_Name ,Data_Array_Offset ,Node_Name
,Address
,Length ,Bytes_Per_Field
,Scan_Interval
,Function
Chiller1_emulation ,DA_CHILLER1 ,0 ,Chiller1 ,4096 ,1 ,2 ,1.0s ,Wrbc
Specify the
address in decimal Length must be
set to 1 when
Bytes_Per_Field is
specified.
A value from 1 to 4 -tells the
driver how many
consecutive addresses to
write to The data value
written to each address is
based on the single value
extracted from offset 0 in the
Data Array DA_CHILLER1