Introduction

FrSky is constantly looking to improve performance and reliability of  RC transmission. The FrSky ACCESS protocols are the most advanced to  date as it offers more features than traditional protocols.

FrSky has developed excellent new ideas that expand the role that a  traditional protocol would play. Building on our well acclaimed ACCST  protocol, ACCESS offers visionary features like Smart Share™,  Smart Match™, and Trio Control ™. Once a receiver is bound to a radio,  it can be re-bound at any time without accessing your receivers bind  button. Sharing models has never been easier, and updating has also been  simplified, you no longer need to physically connect your receivers for  updating. In addition, new tools like a Spectrum Analyzer and Power  Meter are now available on your transmitter.

Always on the cutting edge of technology, we have developed ACCESS to  improve your flying experience by allowing you to do more with your  transmitter and receiver than ever before.

Main Functions and Features

Supports 24 full-range channels Some   models  require more than the 16 provided by the previous protocol.   For  these  users, ACCESS can use up to 24 channels from one signal.

	Over-the-air (OTA) updates, and configuration Thanks to over-the-air function, the need to access the  receiver for product updates, and configuration are eliminated because  this procedure is now achieved wirelessly with the OTA products.
	Automatic binding(Smart MatchTM) Binding  to your model is more secure than ever before. Once a receiver  is registered to a radio, you can easily bind to your models wirelessly  without accessing your receiver F/S button. And dual certification of  the transmitter and receiver make the binding process safer than before.
	Channel remapping Have  you ever plugged-in and installed a receiver just to  find out  everything was plugged into the wrong input? Now you can simply  remap  the channel order on your transmitter.
	Manageable telemetry (Trio ControlTM) You  are able to configure telemetry for up to 3 receivers  simultaneously  through the radio. You no longer need to use STK tools  and Smart Port  allows the use of third-party input/output devices with  pass-through  mode.
	Allows radio to act as a Spectrum Analyzer You  are now able to use your transmitter to survey the airwaves, which  can  measure your signal strength and others in your area. The Spectrum   Analyzer allows the user to measure the power, noise, and distortion of   the frequencies around.
	Allows radio to act as a Power Meter The RF power of external devices can be measured with the addition of this new feature.
	Advanced Encryption Algorithm Higher Encryption means more peace of mind that your model’s signal will not be interfered with.

System Performance

Elevated performance with constantly upgrading FrSky products!

Latency

Control and Telemetry Range

Q&A

Q1: What is Smart Match^TM ?

A: Now you get extra security before you fly. Smart Match^TM acquires dual certification from your receiver and your transmitter to give you double the protection.

Q2: What is Smart Share^TM?

A: Now you can bind multiple transmitters to a receiver and Smart Share^TM assures that you have a unique certification for each transmitter. If  you fly competitively you can set up two identical transmitters and have  a spare one ready to go in the event you need it. No need to find the  bind button on the receiver. It’s all ready to go. Many clubs have  trainer aircraft to help new modelers. Now it is easy to allow  authorized multiple transmitters to bind with the trainer aircraft  receiver.

Q3: What is Trio Control^TM?

A: ACCESS allows one transmitter to control the signal  and/or telemetry for up to 3 receivers per model. Receiver redundancy  provides an extra layer of safety when flying larger models.

Q4: What are the improvements of ACCESS protocol when compare to ACCST?

A: The ACCESS protocol supports up to 24 channels with increased  transmission rate and lower latency (Total latency from Tx stick input  to Rx channel output) and the elevated performance.

• 8 channel mode: Fixed 11ms latency / Telemetry upstream rate increased 40% / Telemetry downstream rate increased 60%
• 16 channel mode: 14 ~ 23ms latency / Telemetry upstream rate increased 40% / Telemetry downstream rate increased 60%
• 24 channel mode: 14 ~ 23ms latency / Telemetry downstream rate increased by 60%

Q5: Is there any differences between the old and new products when using the ACCESS protocol?

A: Yes. Some of the new functions like the Power Meter  were developed and optimized with the new FrSky transmitters (e.g.  Taranis X-Lite Pro). When it comes to wireless performance, the new  upgraded RF module is built specifically to use the new ACCESS protocol.  This will provide a superior link than if used on a standard module.

Q6: What frequency band will be supported by the new ACCESS protocol?

A: The FrSky ACCESS protocol will be applied to both  900MHz and 2.4GHz working frequency bands with different differences in  performance. This will work cohesively with the new dual frequency  products like transmitters, Tx modules, and receivers being released  this year.

Q7: In what scenario can I use the Smart Share^TM function?

1. A user has 3 different FrSky radios for each type of aircraft and  would like to fly them all with a single radio. As long as the user has  already bound to the receivers, they do not need to access the bind  button on the receiver to switch transmitters.
2. RC Competitors often carry a back-up radio just in case something  happens to the primary radio. In this case, the pilot can switch to the  2nd radio without accessing the bind button on the receiver of their  model.
3. Clubs that own and operate community special purpose planes, like  aircraft for towing gliders up to altitude, will no longer need to only  have 1 designated radio for that plane. Each authorized pilot will be  able to use his or her own FrSky Transmitter with their own unique  identification ID.
4. A user that wants to share a model with a friend can now allow the  user to bind to the model without access to the bind button. When the  model is returned, it can simply be re-bound without accessing the bind  button.

A: The 1st batch of updates includes RX4R, RX6R, G-RX6, and G-RX8.  The 2nd batch will include RXSR, XM, XM Plus.

A: The transmitters do have separate modes (LBT and Non-LBT modes). The ACCESS receiver will automatically recognize the working mode according to the transmitter when they are communicating. The LBT mode only works in the EU.  Users in the US and other places can choose either mode to use.

A: Yes, users can bind the ACCST D16 receivers with a new ACCESS transmitter. FrSky also have the external options (XJT and XJT Lite) for users to bind the older receivers.

A: FrSky will mostly adopt the 8 pins module interface (Lite version) for the new coming radios. For the manufacturers of the third-party external module who follow the requirements below, FrSky will offer the necessary supports of software and hardware including the technical material, interface design and etc.
 1. The third-party external modules should be verified by FrSky compatibility tests;
 2. The manufacturer does not infringe on others (individual, organization and company) intellectual properties.
 Using an unverified external module can cause product impairment. The unverified third-party manufacturer is responsible for any damages that may occur, and the FrSky users warranty will be invalid.

A: The latency basically occurs in 4 phases,
 1. Random input latency
 2. Transmission latency
 3. RF latency
 4. Output latency (Fixed 3ms)

Q13: How to test the latency of signal transmission between transmitter and receiver?

Tool
Transmitter	ACCESS: X-Lite Pro ( ISRM Software Version: 1.1.3 or later )ACCST: X9DP / X9DP SE / Q X7
Receiver	R-XSR / RXSR-FC / RX4R / RX6R
Firmware	XlitePro_Latency.binX7_HeartBeat_Latency.binX7_NoHeartBeat_Latency.bin(HeartBeat is a built-in function  of RF module, it works as a timing synchronization mechanism in order to  reduce latency. This function will be enabled by OpenTX 2.3 and later  versions, and has already been enabled by all FrOS versions. )
Methodology	Connect the “+” pin of S.Port to the CH0 of logic analyzer Connect the “-” pin of S.Port to the GND of logic analyzer Connect the ACCESS_TX to the CH1 of logic analyzer (Optional step) Connect the SBUS OUT (Rx) to the CH2 of logic analyzer Connect the GND (Rx) to the GND of logic analyzer Set the random switch on/off through the firmware Separately test the latency of different modes (8CH / 16CH / 24CH Mode),  please select the corresponding ChRange (ChRange 1-8/1-16/1-24) (Note: The tested values with all channels enabled is more in line with the actual usage)

(state until 18.10.2019. Data without guarantee.)