MLB 100 APX340 Install

New installation here. All is working well except when configuring the MLB with the UAT software I cannot get the pressure altitude to display correctly. I get -1025 instead of around zero. Pressure altitude is correct on the 340 display. I have checked all wiring between the two units and all is well. What am I missing?????

Mike

Here is what I found out today. I talked to Roland this morning and he advised me to disable the pseudo squat switch in both the the 340 and the 540. I did and no changes. I then pulled a new 340 transponder from my aircraft and slid it into the tray and everything worked without even doing any configuration changes to my transponder. Sooooo this tells me I either have configuration issues with the first 340 or we have a bad 340 that is not repeating the encoder info via pin 6 to pin 7 on the MLB. I believe this also verifies my wiring.  Only other thing I noticed is the TIS-b flag is displayed on the 540 all the time. This system is wired according to Rev 5 diagram using RS232.

I am also having issues enabling the wifi and bluetooth on this customers new 540 just a heads up.

Mike

Mike

Mike,

The "Repeated" altitude out of the 340 should be active at all times (if wired).  I've honestly never checked one out without having first programmed the tail number, ADS-B parameters, etc.  It may be that it's not configured, and that output may not go active until it is.  I'll have to investigate if that's how it's "supposed" to work.  The default protocol for that output is "Icarus" format, and is not configurable.  Let me know what you find.