AXP340/322 ADS-B Transponder

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bezel lighting

Printed From: Avidyne
Category: Avidyne General
Forum Name: AXP340/322 ADS-B Transponder
Forum Description: Topics on the Avidyne AXP340/322 ADS-B Transponder
URL: https://avidynelive.com/forum_posts.asp?TID=475
Printed Date: 26 Mar 2026 at 2:13pm
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com

Topic: bezel lighting

Posted By: oskrypuch
Subject: bezel lighting
Date Posted: 04 Dec 2014 at 4:16pm

Oddity about the bezel lights. (Edit: AXP340)

With control set to "normal" ...

"The display brightness/backlighting is controlled from the
ambient light sensor and the bezel is controlled by the
lighting bus."

The panel dimmer runs the bezel buttons up/down OK. But, when the panel dimmer is set to OFF, the bezel lights go to MAX. I would prefer them to just go out. Any way to change that behavior? Can't see anything in the install manual.

* Orest

Replies:

Posted By: Gary T
Date Posted: 04 Dec 2014 at 4:43pm

From p. 92 of the IFD540 installation manual ( did your installer try this configuration?):

Page 90 and 91 likely apply as well.

Table 72: Lighting Bus Configuration

To calibrate the dimming bus:

1. Select desired dimBus Type;

2. Select the dimBus Max Voltage field;

3. Push the right bezel knob;

4. Set the dimming bus to the maximum value (e.g. full clockwise position on dimming rheostat);

5. Push the right bezel knob to store;

Repeat the process for the minimum value (use full counter-clockwise position of rheostat)

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Gary-T

Posted By: oskrypuch
Date Posted: 04 Dec 2014 at 5:19pm

This is for the AXP340.

* Orest

Posted By: Gary T
Date Posted: 05 Dec 2014 at 3:50am

Orest,

Which configuration from the AXP340 install manual did your installer program?

Maybe try ambient light sensor only to eliminate effects from your dimming

control(OFF position)?

6.1.16 Lighting Control

The AXP340 has an integrated ambient light sensor in addition to an external input connection from the aircraft lighting bus (if available). This configuration setting selects the way in which the integrated light sensor and the lighting bus input control the brightness of the LCD and the bezel. Selected Method	Description of lighting control
Normal mode	The display brightness/backlighting is controlled from the ambient light sensor and the bezel is controlled by the lighting bus.
Bus Only	The lighting bus is used to control the bezel and the display brightness/backlighting.
Sensor Only	The ambient light sensor is used to control the bezel and the display brightness/backlighting.

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Gary-T

Posted By: oskrypuch
Date Posted: 05 Dec 2014 at 4:28am

Yes, I thought we tried BUS ONLY, but it didn't change the behavior. Will try it again.

I suppose outdoors, the buttons won't seem too bright, even if we can't get them to dim out.

* Orest

Posted By: Gring
Date Posted: 05 Dec 2014 at 6:03am

Orest, I played around with the lighting settings on both the IFD540 and the AXP340 and was able to get them to do what I wanted. I use a combination of the light sensor and the lighting rheostat in the aircraft and it works well. My AXP340 buttons are lighted in the day on full brightness, as are the AMX240 buttons and then dim at night.

Posted By: oskrypuch
Date Posted: 05 Dec 2014 at 6:25am

If you have a chance, would love to see a screen shot of the service screens of your lighting setup, or if you wrote the values down ...

* Orest

Posted By: Gring
Date Posted: 05 Dec 2014 at 7:17am

I'm out of town until Sunday, but will get you them then.

Posted By: oskrypuch
Date Posted: 05 Dec 2014 at 7:59am

Most appreciated.

* Orest