Operation Manual

Operational procedures
75
850-165186 / Rev.B
On twin trawl Bravo, the Twin Spread 2 sensor must be
mounted on the port t rawl door, and the three communication
transducers on the sensor must not be obstructed.
Remote 2 is placed on the centre clump of Bravo.
Remote 4 is placed on the starboard door of Bravo.
This configuration will allow the Twin Spread sensors on each
dual trawl Alpha and Bravo to measure the distance from the
port door to the centre clump directly. It will also measure the
distance between the two trawl doors.
In order to calculate the distance between the centre clump and
the starboard door, you must perform the necessary settings on
the PI54. This is however only possible with one of the twin
trawls, as the current software version does not support this
function.
Sensor setup
Observe the procedure below to set up a Twin Spread
configuration with the settings defined above.
In this procedure, sensors 1, 2, 3 and 4 ar e used, and no other
sensors are shown. Due to the fact that each Twin Spread sensor
occupy two communication channels, the setup program
requires that each sensor is configured as if it was two separate
sensors, but not necessarily sensors 1 through 4. The remaining
two channels can be used for other sensors.
We strongly suggest that you use the form s in the front of this
manual to write down the sensor you have with information
about their update rates and communication channels.
1 Press the MENU button to open the main menu.
2 Open the Setup menu (4), and select Sensor setup (5).
3 Press the ENT key to bypass the warning page.
4 To configure the Twin Spread sensor, enter the following
parameters:
a Set Sensor 1 type to SINGLE to activate the sensor.
b Set Update 1 rate to FAST.
c Set Measure 1 to SPREAD.
d Set Channel to 02.
e Set Sensor 2 type to SINGLE to activate the sensor.
f Set Update 2 rate to FAST.
g Set Measure 2 to SPREAD.