Unit installation

FS70 Trawl Sonar System
82 974-24007001/4.1
5.4.16 Host FS70 Software Start-up Sequence of Events
In this section we will be addressing the telemetry communication
and highlighting the action/problems and the possible causes.
What happens when you start up the host software?
When you start up the FS host software you are establishing
“Digital” communication with the TTM boards located inside the
Power/TTM unit.
The communication is establish between the PC and the TTM using
the host software commend by clicking on “Detect Head” if the host
do not detect the “Head” you will have to troubleshoot where the
problem may be as indicated below.
Troubleshooting head detection problems:
Check COM port is activated in host software. If not, then
activate the COM port and re-detect head.
If head not detected, then check connection between the PC
and TTM. If OK, the TTM needs servicing.
After the host has detected the “digital side” of the TTM board, the
“Analog” side of the TTM board and via the LF1 telemetry board
unit completes the downlink communication through the LF1
telemetry board located in the sonar head.
5.4.17 What happens when you click “RUN”
The next steps after the host software is detected and you hit the
“Run” button are:
Cable Calibration
The CPU board will request a series of transmit pulses from the
transmitter to initiate the cable calibration. While this is occurring
the surface unit (via the TTM/LF1 board) will increase/decrease the
values (returned signal “echo’s”) via the receiver board and will be
uplinked and written to the Digital-to-Analog Converter “DAC”
such that the Gain-Detect (monitor by the TTM) is first detected
then intentionally turned off and then detected again by changing