B.U.D.S. Connection Issue

by Bob Yanniello in 912iS Technical Questions 11 months ago

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Re: B.U.D.S. Connection Issue

by Bill Hertzel » 11 months ago

Bill Hertzel

13 1.95k 7.96k

" ...This module was replaced last October ... which was after ... (the) last successful download."

The Plot thickens!
Always ask yourself," What has changed since the last time it worked?"

Anything else you're keeping from us? ?

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: B.U.D.S. Connection Issue

by Bob Yanniello » 11 months ago

Bob Yanniello

22 91 191

Well, Bill, IF the HIC module circuit board was created correctly, it should only connect the A and B buses together and pass through, which was why I didn’t pay it much attention, but something is obviously wrong, so to your point, assume nothing. See attached snippets from Van’s schematic. You can see that Van’s doesn’t carry a dedicated ground through the connector; they use the shield as the ground. But the HIC module is definitely common to both of the aircraft for which I’ve not been successful in connecting and was not in the system when Lockwood was able to successfully connect my dongle to their ECU, so it is a suspect.

Still waiting for someone on VAF with a new HIC module to confirm if they have successfully downloaded their logs - no responses after almost two days now. And nobody with a 12iS on this forum has chimed in either.

I ran the tests you suggested. Here are my results:

Unpowered resistance across pins 2 & 7 - 63 ohms, so it appears only two terminating resistors.

All voltages listed below are referenced to ground…

With master on, but Lanes not powered: 1.38 V at both pins 2 & 7

Lanes powered but not connected to the dongle: 2.51 V on pin 2, 2.35 V on pin 7

Master on, dongle connected, BUDS program running, but Lanes off: 2.46 V at both pins 2 & 7

Lanes powered, dongle connected and BUDS running: 2.54 V on pin 2, 3.39 V on pin 7.

I expected pin 7, Hi, to have read consistently higher than 2, but that wasn’t always the case, so the data seem inconsistent to me.

So, what’s your expert assessment?

36186_2_2023-05-10 06.25.05.jpg (You do not have access to download this file.)

36186_2_2023-05-10 06.26.12.jpg (You do not have access to download this file.)

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Re: B.U.D.S. Connection Issue

by Bob Yanniello » 11 months ago

Bob Yanniello

22 91 191

Problem solved!!! The new HIC module has the HI & LOW lines REVERSED!!! I just swapped them and it’s now working fine.

As you said, Bill, “assume nothing”. As always, thanks for your support and sharing of your knowledge and experience.

Thanks again.

Thank you said by: Jon Tensfeldt, RotaxOwner Admin, Bill Hertzel

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Re: B.U.D.S. Connection Issue

by Bill Hertzel » 11 months ago

Bill Hertzel

13 1.95k 7.96k

It appears my earlier post was incorrect where I stated;

Ref. DB9 Connector CAN-Bus Pinouts.
Pin #2 = Ground
Pin #3 = CAN_Low
Pin #7 = CAN_Hi

It should have been;

Ref. DB9 Connector CAN-Bus Pinouts.
Pin #2 = CAN_Low
Pin #3 = Ground
Pin #7 = CAN_Hi

I have corrected the earlier post so this bad info does not get propagated.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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B.U.D.S. Connection Issue

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