Nortek Signature Series - Data Formats; Data Packet Header Definition

Integrator's Guide48
© 2017 Nortek AS
6 Data formats
Note: All data of the AD2CP interface are stored/sent as Little Endian. Each output data packet
sent/stored by the AD2CP consists of a Header part and a Data Record part:
Header
Synchronization, ID, length
and Checksums.
Data Record
Data
For the SignatureWaves software to read a valid .ad2cp file it must contain both the Header and Data
Record. The Header information can be obtained by using the command GETALL.
The following chapters describe the format of the Header and the different variants of the Data Record.
6.1 Header Definition
The Header consists of the following fields:
Field
Size
Description
Sync
8 bits
Always 0xA5
Header Size
8 bits
(unsigned)
Size (number of bytes) of the Header.
ID
8 bits
Defines type of the following Data Record.
0x15 – Burst Data Record.
0x16 – Average Data Record.
0x17 – Bottom Track Data Record.
0x18 – Interleaved Burst Data Record (beam 5).
0x1A - Burst Altimeter Raw Record.
0x1B - DVL Bottom Track Record.
0x1C - Echo Sounder Record.
0x1D - DVL Water Track Record.
0x1E - Altimeter Record.
0x1F - Avg Altimeter Raw Record.
0xA0 - String Data Record, eg. GPS NMEA data, comment
from the FWRITE command.
Family
8 bits
Defines the Instrument Family.
0x10 – AD2CP Family
Data Size
16 bits
(unsigned)
Size (number of bytes) of the following Data Record.
Data Checksum
16 bits
Checksum of the following Data Record.
Header Checksum
16 bits
Checksum of all fields of the Header (excepts the Header
Checksum itself).