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  #1  
Old 03-06-2010
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billbalme is on a distinguished road
Wiring Schematic for boat electronics

I’m a little perplexed at how to connect up all my instruments. I have all the manuals and have read them – but in spite of being a reasonably competent chap, I’m failing miserably to work out how to connect what to what. I also fear connecting it wrongly and doing damage… I now have:

Radar: Raymarine (RL80CRC)
GPS: Raynav 300 GPS/Plotter
Instruments: Raymarine ST60 Wind, Depth & Speed – and Graphic display
Radio: ICOM 502 VHF
ICOM 802 SSB
PC/SeaTalk/NMEA Interface Box

I can daisy-chain the instruments together – they each have SeaTalk In and SeaTalk Out sockets.
Do I connect the first SeaTalk link in the chain to the Interface box?
How do I connect the GPS and Radar which have only one SeaTalk socket each. Are they to be connected in parallel to the SeaTalk connections in the interface box? Can one go at the end of the instrument daisy chain?

The VHF and SSB both have DSC calling – which means I need a GPS hook-up. Do I connect them both to the NEMA OUT on the interface box?

How do I connect the computer? I have a 9pin Serial connector with three leads with which I hope to get GPS data to the PC.

Appreciate any help I can get (again!)

Thanks,
Bill
s/v Toodle-oo!
PS37 #148
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Old 03-07-2010
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stevemac00 is on a distinguished road
It shouldn't matter which comes first - just link them up in a chain. I'm not sure which "box" you have but typically you can have up to 3 connections to your NMEA out (computer, SSB and VHF).

The GPS only has one out because it only "talks" and doesn't "listen".

Connecting the computer should only require data-in and ground since it only "listens" as well. You'll need to find out which wires on your PC serial connector are this and connect them to the "data out" and ground on the box.

You shouldn't damage anything by connecting wrong wires. I would connect GPS first to interface box and then out to computer. The computer has some monitoring software so you can see the NMEA sentences to verify all is correct. Then hookup RADAR then daisy chain the remainder. It should be fun.
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