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  #1  
Old 05-24-2021, 11:29 AM
tdragger1966 tdragger1966 is offline
 
Join Date: Oct 2020
Location: Denver, CO
Posts: 25
Default Special CANBus cable or just M27500 2-conductor??

I came across this in a couple of listings for a specialized Carlisle CANBus cable:

"GARMIN documentation recommends the use of this CAN24TST120 (CIT) cable to interface the CAN Bus on G3X..."

I can't find this anywhere in the Garmin install docs and even the Garmin how-to videos seem to show standard M27500 shielded cable. At ~5x the cost is this cable really necessary? What did y'all use for CANBus wiring?
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  #2  
Old 05-24-2021, 11:49 AM
ColoradoSolar ColoradoSolar is offline
 
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Location: Westcliffe, Colorado
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I just used standard M27500 cable
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  #3  
Old 05-24-2021, 01:58 PM
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JoopSJ JoopSJ is offline
 
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Steinair sells MIL-Spec Tefzel wire.
https://www.steinair.com/product/22-...ctor-shielded/
Very good quality.

You will also need the 3 conductor for Rs232 connection.
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  #4  
Old 05-24-2021, 02:33 PM
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fl-mike fl-mike is offline
 
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Iím using EN2714-013B cable. Lighter weight and spiral shield. While not quite as good as braided, it is SO much easier to work with and smaller.
This is what Airbus uses on their aircraft.
I got mine from Aircostcontrol.

EN 2714-013B is pair
EN 2714-013C is triad
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  #5  
Old 05-24-2021, 03:50 PM
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mfleming mfleming is offline
 
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Location: Joseph, Oregon
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So to answer your question directly.

Maybe

If your Can Bus run is less than 66ft then the 22-2S will work just fine but if your total run exceeds 66ft, then yes, youíll need the expensive stuff.

Iím no expert, just repeating what Garmin told me when I asked the same question to them.

PS- 66í is easy to exceed.
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  #6  
Old 05-24-2021, 06:09 PM
tdragger1966 tdragger1966 is offline
 
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Location: Denver, CO
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Quote:
Originally Posted by mfleming View Post
So to answer your question directly.

Maybe

If your Can Bus run is less than 66ft then the 22-2S will work just fine but if your total run exceeds 66ft, then yes, youíll need the expensive stuff.

Iím no expert, just repeating what Garmin told me when I asked the same question to them.

PS- 66í is easy to exceed.
Gotcha. Thanks! My plan is to run from AP roll servo in right wing to avionics in the panel to GMU11 in left wing and finally terminate at AP pitch servo in empennage. So, yeah, might get up to 66. Could probably have saved some run by mounting the GMU in the tail also but worried about the 2 AP servos and who knows what else that might interfere. Need to get the tape measure out...
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  #7  
Old 05-24-2021, 06:13 PM
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mfleming mfleming is offline
 
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Quote:
Originally Posted by tdragger1966 View Post
Gotcha. Thanks! My plan is to run from AP roll servo in right wing to avionics in the panel to GMU11 in left wing and finally terminate at AP pitch servo in empennage. So, yeah, might get up to 66. Could probably have saved some run by mounting the GMU in the tail also but worried about the 2 AP servos and who knows what else that might interfere. Need to get the tape measure out...
Yes, a lot of people don't realize how much length is added when all the ups, downs and turns are added up. I was told there's no way my -7 Can Bus should add up to 61' but it does and there's little or no room to trim it down
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RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring completed
Avionics harness build in progress
Donated for 2021 and so should you
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  #8  
Old 05-24-2021, 06:18 PM
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RVbySDI RVbySDI is offline
 
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Quote:
Originally Posted by tdragger1966 View Post
Gotcha. Thanks! My plan is to run from AP roll servo in right wing to avionics in the panel to GMU11 in left wing and finally terminate at AP pitch servo in empennage. So, yeah, might get up to 66. Could probably have saved some run by mounting the GMU in the tail also but worried about the 2 AP servos and who knows what else that might interfere. Need to get the tape measure out...
there are a lot of G3X systems with the GMU11 terminating in the tail. They donít seem to be talking about issues with that installation location.
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  #9  
Old 05-25-2021, 06:52 AM
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Walt Walt is offline
 
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If you put the GMU11 either out in the tip by the roll servo or on the back deck you can just extend the CAN bus a few feet from the servos to reach it.
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