L3 Comminications SERIES 5000 Operation And Maintenance Manual - page 202
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Towfish Commands
C-23
C.6.10 Datalogger On/Off commands
The 4 acceptable commands will be:
$PKLA,PC1:
Will turn power off to the sonar only.
$PKLA,PC2:
Will turn power off to the TPU only.
$PKLA,PC3:
Will turn power on to both the TPU and sonar.
$PKLA,PC0:
Will turn power off to both the TPU and sonar.
$PKLA,PL2:
Will shut down data logger in the proper Linux sequence.