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Re: [Paparazzi-devel] telemetry messages on request

From: Felix Ruess
Subject: Re: [Paparazzi-devel] telemetry messages on request
Date: Tue, 6 Oct 2015 21:11:23 +0200

Hi Refik,

that is a good question, unfortunately I don't know of a good way to solve this (like how to assign different time slots to up/down link).
You are not the first to have this problem, so any ideas on how to solve this would be welcome.

On a side note: IIRC the 868MHz modems only have a 10% duty cycle and there are times where the xbee will not send messages to respect that.
But since I never had a 868MHz xbee, I'm not quite sure how they handle this....

Cheers, Felix

On Mon, Oct 5, 2015 at 4:12 PM, Refik Sever <address@hidden> wrote:



We are using Xbee 868 modem. The downlink and uplink shares the same frequency. Sometimes, we send a command from GCS but it does not make any difference and it dissappears. I think that it corrupts with the telemetry messages coming from airframe.


Is it possible to synchronize the telemetry and telecommand messages for Xbee? Telemetry messages may be send upon periodical request from GCS.  There may be different timeslots for telecommand and telemetry.


Does anybody have any suggestion for that?


Do you recommend a better serial modem other than Xbee?





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