FieldServer FS-8700-80 - Manual (Page 28)

McQuay Micro Tech Open Protocol Driver Manual Page 28 of 43
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Appendix A.5. 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