RiverPro and RioPro ADCP Guide
October 2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 173
NMEA PD0 Message Format
BIT POSITIONS
BYTE
7
6
5
4
3
2
1
0
1
ID Code
LSB 22
2
MSB 20
3
Msg ID
4
5
Msg Size
6
7
Delta Time
8
9
10
11
12
13
14
15
ASCII NMEA message
↓
xx
Figure 44.
NMEA PD0 Data Message
Table 42:
NMEA PD0 Data Messages
Hex Digit
Binary
Byte
Field
Description
1-4
1-2
ID Code
Stores the status data identification word ID 2022h.
5-8
3-4
Msg ID
Internal GGA=4, VTG=5
External GGA=204, VTG=205,DBT=206,HDT=207, All others=200
9-12
5-6
Msg Size
word size of NMEA message
13-30
7-14
Delta Time
8 byte IEEE double floating point format -
Difference between ensemble time and NMEA message receipt time.
31-
15-
ASCII NMEA message
The ASCII NMEA message received from the external device is inserted as re-
ceived. The messages size is variable.
WinRiver II
may add additional bytes.
For example, WinRiver II does not add any bytes to the Bottom Track data, but does insert
data in place of other bytes. The Navigation NMEA strings (up to 275 bytes) are stored in the
*r.000 raw data between the Bottom Track data and the Reserved/Checksum data. WinRiver
II output data format is described in the WinRiver II User’s Guide.
