FieldServer FS-8700-80 instruction manual DACHILLER1

McQuay Micro Tech Open Protocol Driver Manual Page 30 of 35

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

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