Galleon Technical Support
GPS Clock Unit

� Red �Data� LED does not flash at 1 second intervals.

� Green �Synch� LED stays on continuously.

� GPS Cabling Requirements

� Power Supply Requirement

� Signal Reception

� Maximum Cabling Distance

Red �Data� LED does not flash at 1 second intervals.

The red �Data� LED should flash at one second intervals to indicate that serial data is being sent from the GPS receiver.

Solution: Check that the microcontroller unit and the GPS antenna unit are both powered on. Check the cabling between the two connector boxes.

Green �Synch� LED stays on continuously.

The green �Synch� LED when on, indicates that the Microcontroller is waiting for the receiver to lock on to enough satellites to give the time.

Solution: On a new installation it could take a considerable amount of time for the GPS unit to lock on to enough satellites. It may help to reposition the antenna, so that it has a clear view of the sky in all directions (180 degrees).

GPS Cabling Requirements

0.2 mm six core security \ alarm cable is required between the two connector boxes in order to position the GPS antenna on a roof top. Cable rolls are available from Galleon Systems Limited on request.

Power Supply Requirements

The GPS unit requires two 12V centre positive power supplies. One power supply for the microcontroller unit and a further one for the GPS antenna.

Signal Reception

Providing the antenna has a good clear view of the sky in all directions, a GPS signal can be received anywhere in the world.

Maximum Cabling Distance

The maximum distance between the antenna unit and the GPS receiver unit is 100m, using 6 core alarm cable or up to 500m using twisted pair cable. Cable rolls are available from Galleon Systems Limited on request.

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