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IMAGENEX TECHNOLOGY CORP.
05FEB16
MODEL 852 DIGITAL ECHO SOUNDER
SERIAL INTERFACE SPECIFICATION (v1.04)
OVERVIEW
The Model 852 Digital Echo Sounder communicates over a 2-wire differential RS-485
serial data transmission line or optionally a half-duplex RS-232 data line. To interrogate
the echo sounder and receive echo data, a Switch Data Command string is sent via a serial
command program at a baud rate of
115200 bps, No Parity, 8 Data Bits and 1 Stop Bit
.
When the Switch Data command is accepted, the echo sounder transmits, receives and
sends its return data back to the commanding program.
SWITCH DATA COMMAND
The echo sounder accepts up to 27 bytes of switch data from the serial interface and must
see the switch data header (2 bytes:
0xFE
and
0x44
HEX) in order to process the
switches. The echo sounder will stop accepting switch data when it sees the termination
byte (
0xFD
HEX). The termination byte must be present for the echo sounder to process
the switches.
Note: the Termination Byte is the only switch value allowed
to have a value of 0xFD. All other switches should be set
higher or lower than 0xFD (253 Decimal) so they are not
interpreted as a termination byte!
Byte #
Description
0 – 7
0xFE
0x44
Head
ID
Range
Reserved
0
Reserved
0
Master/
Slave
Reserved
0
8 – 15
Start
Gain
Reserved
0
Absorp-
tion
Reversed
0
Reserved
0
Reserved
0
Pulse
Length
Profile
MinRange
16 – 23 Reserved
0
Reserved
0
External
Trigger
Data
Points
Reserved
0
Reserved
0
Profile Reserved
0
24 – 26
Switch
Delay
Freq-
uency
Term.
0xFD
Table 1 Model 852 Switch Data Command To Echo Sounder
