Teledyne RD Instruments SENTINEL V REAL-TIME, Руководство по эксплуатации

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September
2017 Sentinel V SC and RT Operation Manual
Page 250
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Header information is the first item sent by the ADCP to the output buffer. The Sentinel V ADCP always
sends the Least Significant Byte (LSB) first.
Table 36: Header Data Format
Binary
Byte
Field Description
1 HDR ID /
Header ID
Stores the header identification byte (7Fh).
2
HDR ID / Data
Source ID
Stores the data source identification byte (7Fh for the Sentinel V ADCP).
3,4 Bytes /
Number of
bytes in
ensemble
This field contains the number of bytes from the start of the current ensemble up to,
but not including, the 2-byte checksum (Figure 117).
5 Spare Undefined.
6 No. DT /
Number of
Data Types
This field contains the number of data types selected for collection. By default,
fixed/variable leader, velocity, correlation magnitude, echo intensity, and percent
good are selected for collection. This field will therefore have a value of six (4 data
types + 2 for the Fixed/Variable Leader data).
7,8 Address Offset
for Data Type
#1 / Offset for
Data Type #1
This field contains the internal memory address offset where the Sentinel V ADCP
will store information for data type #1 (with this firmware, always the Fixed Leader).
Adding “1” to this offset number gives the absolute Binary Byte number in the
ensemble where Data Type #1 begins (the first byte of the ensemble is Binary Byte
#1).
9,10 Address Offset
for Data Type
#2 / Offset for
Data Type #2
This field contains the internal memory address offset where the Sentinel V ADCP
will store information for data type #2 (with this firmware, always the Variable
Leader). Adding “1” to this offset number gives the absolute Binary Byte number in
the ensemble where Data Type #2 begins (the first byte of the ensemble is Binary
Byte #1).
11,12
thru
2n+5,
2n+6
Address
Offsets for
Data Types #3-
n / Offset for
Data Type #3
through #n
These fields contain internal memory address offset where the Sentinel V ADCP will
store information for data type #3 through data type #n. Adding “1” to this offset
number gives the absolute Binary Byte number in the ensemble where Data Types
#3-n begin (first byte of ensemble is Binary Byte) #1).