Klein 3900 Series Operation And Maintenance Manual page 78

B-4
APPENDIX B TPU Software Interface and Control
latest software. If you have an older board it is recommended that you send
your system back for upgrade as this older board is no longer supported.
Default is '0'.
LASER {d = 0,1} (5000 System only). If the sonar contains a fiber-optic
capable telemetry link set this to '1' to enable the on-board laser and deactivate
the copper telemetry link. DO NOT set this unless there is a fiber hooked up to
the towfish and the fiber is properly terminated into the Klein FOI-01 Fiber
Optic interface module. Setting this to '0' deactivates the laser and activates
the standard coaxial uplink. Default is '0'.
ENABLESENSORMESSAGE {d = 0,1}. Setting this to '1' instructs the
TPU to output a sensor message on COM2. This message contains the data
from the onboard sensors and the current time. The format of this message is:
where the fields are hours, minutes, seconds, thousandths of seconds, heading,
pitch, roll and depth. The depth field is in volts. A full scale reading of 5.0
volts corresponds to full scale from the pressure sensor. The full scale of the
sensor must be used to convert this value to depth. The sensor measures
absolute pressure so the atmospheric pressure must also be taken into account
(14.7 psi). An example of the calculation is:
where Volts is the value in the depth field of the sensor message and Full_Scale
is the full scale output of sensor in psi.
ENABLELEAKSENSOR {d = 0,1} (5000 System only). Setting this to '1'
enables leak monitoring. This should only be set if the towfish has the optional
leak sensor installed. If the sensor is not installed setting this to '1' can result in
a false leak warning being generated. Default is '0'.
PREEMPHASIS {d = 0 – 7}. This controls the amount of high-frequency
pre-emphasis applied to the uplink telemetry signal. In conjunction with the
LBOGAIN variable this allows the sonar to drive cables of varying lengths.
For short cables this should be set to '0'. For longer cables this number is
increased to offset the cable dispersion. The optimum setting is achieved when
the telemetry link exhibits zero errors. This can be found by varying the pre-
emphasis with the sonar running until the error rate is a minimum. This is
achieved using the $MLx fish command. When the optimum setting is found
the value can then be entered in to the startup script to apply this value every
time the system is started. NOTE: This is only supported on towfish equipped
with the 14102066 Multiplexer PCB.
Series 3900 Sonar System Operations and Maintenance Manual
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depth = ((Volts * Full_Scale / 5.0) – 14.7) / 1.458 meters
11214510, Rev. 02