October 2017
RiverPro and RioPro ADCP Guide
Page 142
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
In Mode 3 (WM3) the Data Ping is the source of all values describing the ping, such as Code Reps, Trans-
mit Length, and Lag. Values in the Fixed Leader are no longer fixed and may change from ping to ping,
e.g. Cell count, Cell Size, Cell 1 Start, Lag Length. Fixed Leader data also contains hardware information.
The RiverPro/RioPro always sends Fixed Leader data as output data (LSBs first).
Table 19:
Fixed Leader Data Format
Hex Digit
Binary Byte
Field
Description
1-4
1,2
FID / Fixed Leader ID Stores the Fixed Leader identification word (00 00h).
5,6
3
fv / CPU F/W Ver.
Contains the version number of the CPU firmware.
7,8
4
fr / CPU F/W Rev.
Contains the revision number of the CPU firmware.
9-12
5,6
Sys Cfg / System
Configuration
This field defines the RiverPro/RioPro hardware configuration. Convert this field (2
bytes, LSB first) to binary and interpret as follows.
LSB
BITS 7 6 5 4 3 2 1 0
- - - - - 0 0 0 75-kHz SYSTEM
- - - - - 0 0 1 150-kHz SYSTEM
- - - - - 0 1 0 300-kHz SYSTEM
- - - - - 0 1 1 600-kHz SYSTEM
- - - - - 1 0 0 1200-kHz SYSTEM
- - - - - 1 0 1 2400-kHz SYSTEM
- - - - 0 - - - CONCAVE BEAM PAT.
- - - - 1 - - - CONVEX BEAM PAT.
- - 0 0 - - - - SENSOR CONFIG #1
- - 0 1 - - - - SENSOR CONFIG #2
- - 1 0 - - - - SENSOR CONFIG #3
- 0 - - - - - - XDCR HD NOT ATT.
- 1 - - - - - - XDCR HD ATTACHED
0 - - - - - - - DOWN FACING BEAM
1 - - - - - - - UP-FACING BEAM
MSB
BITS 7 6 5 4 3 2 1 0
- - - - - - 0 0 15E BEAM ANGLE
- - - - - - 0 1 20E BEAM ANGLE
- - - - - - 1 0 30E BEAM ANGLE
- - - - - - 1 1 OTHER BEAM ANGLE
0 1 0 0 - - - - 4-BEAM JANUS CONFIG
0 1 0 1 - - - - 5-BM JANUS CFIG DEMOD)
1 1 1 1 - - - - 5-BM JANUS CFIG.(2 DEMD)
Example: Hex 5249 (i.e., hex 49 followed by hex 52) identifies a 150-kHz system,
convex beam pattern, down-facing, 30E beam angle, 5 beams (3 demods).
Note: XDCR HD ATTACHED refers to whether the chassis and transducer are deliv-
ered as one piece; This is not a sensor detect.
13,14
7
PD / Real/Sim Flag
This field is set by default as real data (0).
15,16
8
Lag Length
Lag Length. The lag is the time period between sound pulses. This is varied as re-
quired by the RiverPro/RioPro.
17,18
9
#Bm / Number of
Beams
Contains the number of beams used to calculate velocity data (not physical beams).
The RiverPro/RioPro needs only three beams to calculate water-current velocities.
The fourth beam provides an error velocity that determines data validity. If only
three beams are available, the RiverPro/RioPro does not make this validity check. Ta-
ble 24 (Percent-Good Data Format) has more information.
19,20
10
Number of Cells
Contains the number of depth cells over which the RiverPro/RioPro collects data.
This value changes as measurement conditions, primarily depth, change. This value
does not include the number of cells in surface data, when present.
Scaling: LSD = 1 depth cell; Range = 1 to 128 depth cells
21-24
11,12
Data Pings Per En-
semble
Contains the number of data pings averaged together the automatic pinging of the
RiverPro/RioPro. Scaling: LSD = 1 ping; Range = 0 to 16,384 pings
25-28
13,14
Depth Cell Length
Contains the length of one depth cell of non-surface layer data.
Scaling: LSD = 1 centimeter; Range = 1 to 6400 cm (210 feet)
