Operation
Altimeter Product Manual
0286-SOM-00001, Issue: 09
25
© Tritech International Ltd.
4.2. Dual Frequency Echosounder
The Dual Frequency Echosounder contains two altmeters and an AHRS sensor. This allows
it to output both an altitude and attitude. The altitude readings are interrogate only whereas
the attitude can be either interrogate or free-running.
4.2.1. Echosounder Output
The Dual Frequency Echosounder does not have a free running altitude output. The 500kHz
or 200kHz channel must be interrogated individually.
The 200kHz channel is interrogated using the ASCII character
A
The 500kHz channel is interrogated using the ASCII character
B
The output from the echosounder is as follows:
LAN
Interrogate
Yxxx.xxxm<CR><LF>
Y
= ASCII interrogation character, A for 200kHz, B for 500kHz
xxx.xxx
= range in metres to 3 decimal places
m
= units label for metres
<CR><LF>
= carriage return and line feed terminators.
4.2.2. AHRS Output
Tritech Pin 1 & 2
The AHRS can be set to output in interrogate mode similar to the echosounder output. In
interrogate mode the free running output on pin 5 stops and then the AHRS is interrogated
with the ASCII charactor
C
.
Tritech Pin 5
The main output from the AHRS on the Dual Frequency Echosounder is on pin 5 of the
Tritech connector. In this configuration output the AHRS output is free running.
Note
The output from pin 5 is RS232 Tx only
