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encoder compatibility

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cardinal driver View Drop Down
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    Posted: 21 Sep 2016 at 12:21pm
I having a Skytrax 100 installed, and the avionics shop reports that 

The current encoder installed in the aircraft is not compatible with the Skytrax Serial Altitude input needed so we will need to replace the existing encoder with a unit that is capable of outputting serial altitude data. 

The blind encoder was installed in 2013, it is a Transcal model SSD120-30N.  I checked before installing this model if it would be compatible with the IFD-540, and it was. 

I'm surprised that the encoder would not be compatible with the Skytrax 100.  Can anyone enlighten me?

TIA

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Ibraham View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ibraham Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 2016 at 2:16pm
The link is for install manual, you can check Appendix D for encoder compatibility

http://www.navworx.com/documents/TSO%20ADS600-B%20Installation%20Manual%20240-0008-00-39.pdf
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AviSimpson Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 2016 at 2:29pm
Originally posted by cardinal driver cardinal driver wrote:

I having a Skytrax 100 installed, and the avionics shop reports that 

The current encoder installed in the aircraft is not compatible with the Skytrax Serial Altitude input needed so we will need to replace the existing encoder with a unit that is capable of outputting serial altitude data. 

The blind encoder was installed in 2013, it is a Transcal model SSD120-30N.  I checked before installing this model if it would be compatible with the IFD-540, and it was. 

I'm surprised that the encoder would not be compatible with the Skytrax 100.  Can anyone enlighten me?

TIA


Do you have an AXP340 installed?
Simpson Bennett
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pburger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pburger Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 2016 at 2:41pm
Your encoder only has a gray code (parallel) output.  The IFD-540 can accept either RS-232 serial or gray code (parallel) input, so your encoder will work with the IFD-540.  I suspect the Skytrax 100 requires a RS-232 signal which your encoder doesn't have.

Edited by pburger - 21 Sep 2016 at 2:43pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AviSimpson Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 2016 at 2:45pm
The IFD540 can also accept 429 altitude data.

If an AXP340 is installed you can use the altitude output from pin 6.
Simpson Bennett
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