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ECHO SOUNDER RETURN DATA
Every ping, the echo sounder returns a 12 Byte header, up to 500 points of echo data
(depending on the Switch Data command that was sent) and a terminating byte value of
0xFC. The
total number of bytes
(
N
) returned will be 13, 265 or 513.
Byte #
Description
0 to 5
ASCII
'I'
ASCII
'M','G' or
‘P’
ASCII
'X'
Head
ID
Serial
Status
Reserved
0
6 to 11 Reserved
0
Range
Prof Rng
(LO)
Prof Rng
(HI)
Data
Bytes
(LO)
Data
Bytes
(HI)
12 to
(N-2)
Echo Data
0, 252, 500 Data Bytes
N-1
Term.
0xFC
Table 2 Model 852 Echo Sounder Return Data
BYTE DESCRIPTIONS
Note: All Byte values are shown in decimal unless noted with a '0x' prefix.
N
= total number of return bytes
Byte 0 - 2
Imagenex Return Data Header
ASCII '
IMX
', '
IGX
' or ‘
IPX
’
'I' = 0x49, 'M' = 0x4D', 'G' = 0x47, ‘P’ = 0x50, 'X' = 0x58
ASCII '
IMX
'
In response to a Switch Data Command with Data Points = 25
N = 265, (252 Data Bytes, 252 Points)
ASCII '
IGX
'
In response to a Switch Data Command with Data Points = 50
N = 513, (500 Data Bytes, 500 Points)
ASCII '
IPX
'
In response to a Switch Data Command with Profile = ON
N = 13, (0 Data Bytes, 0 Points)
Byte 3
Head ID
0x11, 0x12, 0x13, 0x14 or 0x15
