RiverPro and RioPro ADCP Guide October 2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 139
Header information is the first item sent by the RiverPro/RioPro to the output buffer. The RiverPro/Ri-
oPro always sends the Least Significant Byte (LSB) first.
Table 18: Header Data Format
Hex Digit Binary Byte Field Description
1,2 1 HDR ID / Header ID Stores the header identification byte (7Fh).
3,4 2 HDR ID / Data
Source ID
Stores the data source identification byte (7Fh for the RiverPro/RioPro).
5-8 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 47).
9,10 5 Spare Undefined.
11,12 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).
13-16 7,8 Address Offset for
Data Type #1 / Off-
set for Data Type #1
This field contains the internal memory address offset where the RiverPro/RioPro
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 en-
semble where Data Type #1 begins (the first byte of the ensemble is Binary Byte #1).
17-20 9,10 Address Offset for
Data Type #2 / Off-
set for Data Type #2
This field contains the internal memory address offset where the RiverPro/RioPro
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).
21-24 thru
2n+13 to
2n+16
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 RiverPro/RioPro 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).
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