Towfish Commands; 3000 System Multiplexer Commands - Klein 3000 Series Operation And Maintenance Manual

B-12
APPENDIX B TPU Software Interface and Control
B.6 Towfish Commands
Although sonar control is normally performed using the Ethernet or NMEA
interfaces, direct control of the towfish is possible. Various parameters of sonar
operation are performed in the towfish, such as waveform selection, TVG page,
etc. These parameters are set by transmitting control messages to the towfish via
the downlink telemetry. The control messages take the form:
where X is the destination, Y is the command and dd is the data for the command.
The destination of the command instructs the downlink processor where to route
the command as there are multiple possible destinations for a command. For
example, one can send commands to the on-board compass, the Transmitter PCB,
the MUX PCB, etc. For the 3000 System the possible destinations are M for the
MUX PCB, S for the SBP, C for the Compass module and A for the auxiliary
RS-232 port.
Issuing commands to the towfish can be done in a number of ways. The most
straightforward technique is to use the towfish command interface in the SonarPro
software. The desired command is simply entered and then sent to the towfish.
Another technique is to use the $PKLA,FC command via the NMEA interface
(COM2). The desired command is simply typed after the 'FC'. For example,
$PKLA,FC$MT9<CR><LF>. The final technique is to use the towfish diagnostics
connectors located inside the TPU. For the 3000 System a terminal can be
connected to COM3 on the DEMUX board. Once again, this is normally reserved
for factory use.
B.6.1 3000 System Multiplexer Commands
$MMd:
$MLd:
$MHd:
Series 3000 Sonar System Operations and Maintenance Manual
$XYd <CR><LF>
Selects the towfish acquisition mode. This command should
not be issued by the user as the format of the data is changed
without the TPU being informed. This command is
inherently sent when the framing mode is changed via the
SonarPro interface.
Selects the low-frequency TVG page where d = 0 – F
hexadecimal. The default page is 7. Increasing the value
increases the gain by 3 dB for each increment. Conversely
decreasing this value decreases the gain by 3 dB.
Selects the high-frequency TVG page where d = 0 – F
hexadecimal. The default page is 7. Increasing the value
increases the gain by 3 dB for each increment. Conversely
decreasing this value decreases the gain by 3 dB.
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