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Thread: EzUHF JR Race firmware v1.53, using the DSMX/DSM2 from Taranis

  1. #1
    Forum Member
    Join Date
    Jul 2015

    Question EzUHF JR Race firmware v1.53, using the DSMX/DSM2 from Taranis


    I'm trying to setup the EzUHF JR module with EzUHFFirmware_TxJRModule_race.fw - (version 1.53) which should allow my Taranis to communicate to the JR Module via DSMX/DSM2. I also flash the equivalent race FW to my 4ch EzUHF receiver. I can successfully bind the receiver to the JR module no issue.

    However the Taranis doesn't seem to communicate with EzUHF JR Module. I tried the different DSM2 / DSMX modules but it will not communicate with the module. When I power up the Taranis, I can only hear 4 beeps from EzUHF JR. There should have been a 5th beep after a pause to indicate the module and the Taranis are connected.

    Any idea what is happening?

    For now I'm going back to non-race (PPM) version which works for now.

    Anyhelp is greatly appreciated. Thanks!

  2. #2
    Forum Member
    Join Date
    Jun 2017
    Did you make any progress on this ? I am having exactly the same issue. I have flashed with latest (1.53) firmware.
    JR Module reports the following:
    Version: 1.53 (6) a1
    Tx Code

    RX Module reports the following:
    Version: 1.53 (6) a2

    Rx Code

    Wondering if the firmware mismatch (a1 vs a2) is part of the issue? Although they do bind correctly.

    I also (same as you) only get 3 beeps, pause, then 4th beep suggesting JR Module is staying in PPM Mode?
    This is Taranis X9D, set to DSM2 mode etc.

    When I look at the TX Servo Positions, there is no movement in response to my control sticks etc. 1.42.5 (version of Immersion RC Tools being used)

  3. #3
    Forum Member
    Join Date
    May 2018
    I have this exact issue and have not been able to solve it.

    Both my firmwares are Version: 1.53 (6) a1 (race TX and sbus rx 8 channel diversity)

    As a side note, the a2 firmware appears if i flash sbus inverted.

    I can make the JRTX and RX bind, but not communicate.

    3 beeps a pause, 4th beep. Never get to a breathing led. Just an ultra fast flickering.

    There were some indications in another forum post that it might help to update the taranis qx7 to the latest opentx firmware (2.2.1 now) but it has made no difference. (changing from 2.2.0 to 2.2.1)

    Anyone got any clues about this? Seems like a common issue.

  4. #4
    Forum Member
    Join Date
    May 2018
    Bug is here: https://github.com/opentx/opentx/issues/5204

    The actual problem is with the upgrade from open-tx 1.6 to 2.0 they fixed a bug in the serial implementation of dsmx, changing from 2 stop bits to 1. This broke EzUHF as it apparently relied on this bug.

    For more information and a possible solution in progress see this thread: http://fpvlab.com/forums/showthread....53-SBUS-Issues

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