New Frsky Air Protocol – ACCESS

If you are a long time Frsky user, you probably recognize the word “ACCST” printed at the bottom left of the Taranis display. ACCST is a TX protocol and it will be soon be replaced by a new protocol – ACCESS.

What is ACCESS Protocol?

ACCESS stands for Advanced Communication Control, Elevated Spread Spectrum. It’s the RF protocol that carries the signal from the radio to the receiver, what I would normally call the air protocol or TX protocol.

The predecessor of ACCESS is ACCST, which has been around for over 10 years. You can find the ACCST label at the bottom left of Taranis X9D+ display.

I will discuss the new features and performance improvements that ACCESS will bring to the table.

Better Performance

Performance improvements from ACCESS include:

  • Lower latency and higher baud rate
  • Supports Up to 24 full range channels

However receiver protocols such as SBUS and FPort can only handle 16 channels, so I am not sure if there will be changes to the receiver protocols as well, or it requires multiple receivers to support the remaining eight extra channels.

Just like SBUS, using higher number of channels will increase latency just like SBUS. Currently with SBUS, we prefer to use 8 channels instead of 16 for the lower latency. We don’t normally need that many channels for flying FPV quadcopters anyway, so 24 channels isn’t really necessary. But the lower latency will certainly be appealing.

Wireless Binding and Firmware Updating

ACCESS allows you to bind and flash new receiver firmware wirelessly.

Once you register a receiver with the radio, you can bind it wirelessly without touching the receiver ever again (or press the bind button). Even after updating the receiver firmware. How is how to bind/register an ACCESS receiver.

I found this to be one of the most exciting new features. TBS has been doing this on the Crossfire for years and I am glad Frsky is finally catching up! Frankly, currently flashing new receiver firmware to Frsky receivers via smartport isn’t the most user friendly, hopefully the wireless method would make it a lot easier.

Better Security

ACCESS has more advanced encryption according to Frsky. Not a huge concern for hobbyists to be honest, but it’s a good thing nonetheless

I also have a feeling that this is a move to make it harder to reverse engineer their protocol, to stop 3rd parties making compatible receivers and transmitter modules that compete with Frsky.  For customers it’s not necessarily good news, as there will be fewer affordable options.

Backward Hardware Compatibility

As far as I know, ACCESS will be supported on some of the existing Frsky receivers, you would just have to flash a new firmware to support ACCESS. However you would have to purchase a new radio to use ACCESS, I don’t think older ACCST radios will support ACCESS.

You will need one of these radios Frsky recently released:

ACCESS firmware for receivers are already available for download on Frsky’s website, but only for five receivers at the time of publishing (May 2019): RXSR, RX6R, RX4R, G-RX6 and G-RX8.

For more info: https://www.frsky-rc.com/frsky-advanced-communication-control-elevated-spread-spectrum-access-protocol-release/

7 thoughts on “New Frsky Air Protocol – ACCESS

  1. Alberto Scotti

    What is not clear to me is if a Tx equipped with an ACCESS Tx module will be able to communicate with older D or V series receivers. If not, I will stay with the old standard, which has been very reliable over time. I have several models equipped
    with D series and V series and do not want to convert to newer receivers…

    Reply
  2. Padcom

    Well, it seems like the only benefit for me is that the ACCESS is capable of sending 24 channels – but only with special receivers because for example the XM module is not capable of doing so. Oh – maybe remapping channels would also be a nice to have (I use it on the CRSF hardware and it is very nice). Long story short I am not planning on upgrading to the new protocol ever. For more advanced features and lower latency I’ll stay with Crossfire.

    Reply
  3. Snake675

    If frsky will not deliver updates to ACCESS protocoll for Taranis X9D and XSR, I probably would quit frsky! You cant be harsh to sellers and force them to decide between frsky and jumper and on the other hand force costumers to throw thier old stuff and buy a hole set of new ones.

    Reply
  4. Rudi Venter

    You can go backwards and forwards with the firmware, just like you can change between FCC and EU firmware, no trap.

    Reply
  5. Rudi Venter

    The statement that older TX’s and RX’s will support ACCESS in the future is in the announcement by FrSky.

    Reply
  6. ched999uk

    Be careful updating ACCESS FW to existing receivers. Reason I say that is do you know you can go back to ACCST if you flash ACCESS? It may be a FRSky trap!!!!!

    Reply
  7. Simon

    “First of all, I have no plan of reviewing the X9 Lite” – The very next article released on OscarLiang is the X9 Lite review!

    “As far as I know, ACCESS will be supported on most of the current Frsky receivers and transmitters” – Would love to hear this direct from Frsky as this is a definite benefit to the users of the current range of TX (QX7, X9D, X-Lite etc).

    Reply

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