Marine Electronics Forum - NMEA 2000 Backbone - Terminators Needed?

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HMBJack
03-24-2012, 10:00 AM
I have three Tees - one for power, and two for devices.

Question: Will this "work" without the end terminators?

My backbone is assembled but it's not signaling to my Lowrance head unit (HDS-8). Thanks,


debugger
03-24-2012, 10:04 AM
nope

HMBJack
03-24-2012, 10:13 AM
Thanks - But can anyone explain to me why?

Like do the terminator poles somehow "connect" to each other?


Flot
03-24-2012, 10:37 AM
Sort of. They are just resistors at either end of the network but they are definitely required. Sometimes your stuff will work without them, but not necessarily for long.

If you aren't in a huge hurry, I have a whole garmin "nmea starter kit" w/terminators and power wire I'd sell for a reasonable price, pm/email me.

debugger
03-24-2012, 11:55 AM
The signal goes down the bus bar and out all the t-connectors then it comes to the end of the chain. The terminator absorbs the energy so it does not bounce back and interfere with new signals. It creates resistance on the chain.

HMBJack
03-24-2012, 12:05 PM
Thank you very much, I put terminators on and it works great now.

King Killer
03-24-2012, 05:14 PM
FLOT

Sent you a PM about your Garmin starter kit.



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