Initial checkout, Turning the 491 on, For the 961/962 – NorthStar Navigation 491 User Manual

Page 23

SECTION THREE — Installing the 491

491 INSTALLATION MANUAL Revision A

PAGE 19

Plug the transducer cable into the

TRANSDUCER

connector of the 491.

If your transducer doesn’t support speed, you can connect a separate
speed sensor, such as the Airmar ST650, to pins 1, 2 and 3, as shown in
the table.

Initial
checkout

This section assumes that the 491, Northstar navigator, and transducer
are now all properly connected. Turning on the navigator automatically
turns on the 491 (be sure your vessel is in the water). To turn the naviga-
tor on, briefly press its PWR key.

Turning the 491 on

For the 961/962

To use the 491 echo sounder, the 961/962 must be running software ver-
sion 3.0 or higher. If not, contact the factory to obtain the upgrade CD. To
install the upgrade, follow the steps on the back of the jewel box.

You must set the 961/962’s Port 3 to “490”:

1. Press STAR to display the SERVICE MENU screen.
2. Press PORT SETUP.
3. Press PORT 3.
4. Set the FORMAT option to 490.

The

STATUS

indicator light on the 491 glows steady green when the 491’s

power is on.

FIGURE 10: Wiring of B260 transducer cable (solder-cup side of connector

shown)

#2 Speed +V
#3 Speed Gnd
#7 Thermistor
#6 Depth 50 kHz –
#9 Depth Shields

#1 Speed Signal
#4 Thermistor

#5 Depth 50 kHz +

#8 Depth 200 kHz +

#10 Depth 200 kHz –

1/2” Max.

3/16”

Wire stripping detail

FIGURE 11: Wiring of B44/B744 and P66 transducer cable (solder-cup side of

connector shown)