DSAB Failure between D100 and D120

[glastarheinz]

I have an EFIS D100 and an EMS D120 in my Glastar. Both worked ok for about 5 years, however with occasional DSAB failures ("NETWORK CONNECTION LOST"). Failure was either selfresetting or a restart of the EFIS and/or EMS corrected the problem. Not so since a few days: DSAB isn't working anymore, the screens can't be swapped (EFIS, resp. EMS not detected). A DSAB reconfiguration on the EFIS is impossible (Standalone Operation, EMS not detected). I checked both DSAB wires (EFIS pins 4/5 to EMS pins 35/34), they are ok. What else can I do to correct the Problem?
Thanks for Your help Heinz

 

[Dynon]

If there's definitely continuity, then you've done everything you can do. That's likely a a hardware problem. Give our support team a call at 425-402-0433 or an email at support at dynonavionics dot com.

 

[fvanpelt]

Re: DSAB Failure after replacing SL30 by GNC255A

In my Sportcruiser I had a Dynon EFIS D100, EMS D120, H34 and Garmin SL30 nav/com, GTX328 transponder and 496 GPS.
Since 2009 all these instruments worked fine.
Due to European regulations my Garmin SL30 nav/com is replaced by a new Garmin GNC255A.
Now the following failure occurs:
Each time I use the PTT to send a message, the DSAB connection is lost immediately! After one to ten seconds the system self-resets and stays stable until I use the PTT again.
The GNC255A seems to work ok.
Anyone familiar with this phenomenon?
What can be the problem? Interference?
Thank you in advance!

 

[Dynon]

Hi Frans - It's definitely not a regular occurrence. One thing to look at is whether or not the coax cable routing changed at all. And if not, doing some re-routing to get the DSAB wires away from the radio wires may prove helpful.

 

[Robski]

Are the antenna leads RG58 or RG400?

RG58 is leakier than the more expensive RG400. I need to change mine to hopefully correct an issue with a shock cooling alarm on cylinder 3 when transmitting at the lower end of the radio frequency range.
That'll get done soon as part of the same 8.33khz radio swap exercise Frans has suffered from.

Also, are the DSAB wires twisted together (UTP - unshielded twisted pair) as specified in the installation manual?
Fortunately spotted this omission on my part before I'd gone too far with my installation.