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FS-8700-49_Data_Aire_DAP Page 26 of 48
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Appendix B. Advanced Topics
Appendix B.1. Additional Driver Specific Map Descriptor Parameters
The driver offers advanced configuration by adding to and extending the Map Descriptors
specific to the Dart Serial Driver.
Column Title Function Legal Values
DA_Func*
Specifies the Data Aire Command/Query
function to be used. Use a function
appropriate to the type of Server
(DAP/Chiller/DAP80) and the type of data
required.
Numeric/Text. See Appendix B.2
for a list of possible values.
DA_Field*
Specifies the data field to be retrieved from
the Server device. Servers are only
capable of responding with a data
composite consisting of many data fields.
This parameter is used to specify the
parameters to be extracted from the data
composite.
Note
1
.
Text. See Appendix B.3 for a list
of possible values as well as Table
4.4.5.1
DA_Assoc*
This field is used to make the association
between passive and active (rdbc/wrbc)
Map Descriptors addressing the same
node. Give the rdbc and its associated
passive Map Descriptors the same value
(any number) and give the wrbc and its
passive Map Descriptors another value for
DA_Assoc.
Any positive integer.
Da_Freq
Used only for connection to DART’s.
Specifies in milliseconds the intervals
between wrbc/rdbc Map Descriptor
execution.
> 18000 (3 minutes)
30000 (5 minutes) recommended
DA_Method
ψ
Specifies the extraction method. Such as
Hex-ASCII to decimal number in 10's of a
degree,
See Appendix B.4 for a list of
possible values.
DA_Bytcnt
ψ
Specifies the number of bytes that are to
be processed by the method specified
above. For method#6 which processes an
array of elements the DA_Bytcnt specifies
the number of bytes that constitute each
element of the array.
>= 1
DA_Offset
ψ
An offset into the data composite that is
returned when the Server is polled. The
offset is the number of bytes from the first
data byte.
0 to the length of the data
composite. No validation is
performed.
DA_Elecnt
ψ
Number of elements that are produced by
the extraction method.
>= 1
ψ
These parameters are only required for custom data extractions not provided for with DA_Field
parameter.