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Old 05-10-2021, 09:03 PM   #1
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Simrad to NMEA2000 connection

I have a Simrad RC42N Rate Compass that I need to connect to a NMEA2000 backbone. Does anybody know the correct connector to go from Simnet to NMEA2000?
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Old 05-10-2021, 10:38 PM   #2
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Does your Simrad RC42N have a cable coming out with a Simnet connector on it?

My memory is that a data cable runs through a water seal into the unit where it can connect via two terminal blocks, one with red and black for NMEA-2000 power and the other for yellow and blue for NMEA 2000 data, and that you can hook whatever compatible cable type you'd like, SimNet, NMEA-2000, or ST-NG to it. Alternately, I remember another terminal block or two for NMEA-0183. If this is the case, you should be able to use a NMEA-2000 cable with no adapter.

If I'm wrong, or you'd prefer to leave what is there there and you've got a cable with a SimNet connector coming out, is it male or female? Maybe one, or both, of these would help?

https://www.defender.com/product.jsp?id=1013580
https://www.defender.com/product.jsp?id=1212046
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Old 05-11-2021, 02:26 AM   #3
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I'm pretty sure you will need a SIMNET COMPASS TO N2K ADAPTOR KIT 000-0127-45 or equiv.

https://www.amazon.com/Lowrance-Simn.../dp/B01DUZ1EHY
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Old 05-11-2021, 09:10 AM   #4
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I think you just need to find a manual for the device. My recollection is the same as gkesden's. Just buy an N2K cable, cut off the correct end, and wire it to the RC42.


Any by the way, I thought the "N" in the RC42N was the newer version of the RC42 that has an N2K cable pre-attached in place of a Simnet cable or other cable. So check that. Yo might get lucky. Or maybe yours was re-cabled at some point.
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Old 05-11-2021, 07:18 PM   #5
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Here's the connection from the RC42. I bought it used. I guess it isn't an RC42N.
Can I just splice the Simnet connection to a NMEA2000 drop cable?
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Old 05-11-2021, 07:30 PM   #6
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Okay. So, I think you have two options...

1) Replace the cable with one that has the NMEA-2000 connection that you want on the end, such as by cutting off one end of a cable and wiring it into the terminal blocks, as earlier described

2) Using the male-male SimNet connector AND the SimNet to NMEA-2000 cable earlier show, or similar, to adapt what you've got to what you want.

I don't think it super likely you'll find a cable with a male SimNet connector on it that goes to NMEA-2000, but, you can find cables like those shown in my earlier email in various lengths.

If it were me, I'd replace the existing cable with the one I wanted of the length I wanted and save the adapters. It is cheaper and has fewer parts. But, I totally understand wanting to leave well enough alone and just adapt.
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Old 05-11-2021, 08:34 PM   #7
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Thanks gkesden,
I ordered the adapter cable and the joiner. Looks like it will work. I appreciate everybody's suggestions.
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