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Appendix A.5. Advanced Map Descriptor Example 1– Reading direct address. This example reads 10 data elements from a McQuay device starting at address 4096 (= 0x1000). The 10 values obtained are stored in
DA_CHILLER1 starting at offset zero.
Map_Descriptor_Name
,Data_Array_Name
,Data_Array_Offset
,Node_Name
,Address
,Length
,Scan_Interval
,Function
Chiller1_emulation ,DA_CHILLER1 ,0 ,Chiller1 ,4096 ,10 ,1.0s ,Rdbc
Appendix A.6. Advanced Map Descriptor Example 2 – Controlling Bytes per Field – Reading This ex ample reads a McQuay device starting at a ddress 4096 (= 0x1000) to 4099 incl. Before storing the data from the responses, the
FieldServer combines the 4 values into a single value and stores this single value in a single Data Array element.
The driver reads address 4096 and gets a value. Call this value v0.
The driver reads address 4097 and gets a value. Call this value v1.
The driver reads address 4098 and gets a value. Call this value v2.
The driver reads address 4099 and gets a value. Call this value v3.
When the 4
th
address has bee read, the driver calculates Total_Value = v0 + v1 * 0x100 + v2 * 0x10000 + v3 * 0x1000000. The Total_Value is
stored in the Data Array.
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 ,4 ,1.0s ,Rdbc
Specify the
address in decimal
A data format of
BYTE is
appropriate,
Specify the
address in decimal
Length must be
set to 1 when
Bytes_per_Field is
specified.
A value between 1 and 4 - tells
the driver how many
consecutive addresses to read
from the remote device. The
data value for each address is
combined into a single value
before it is stored.