Frsky R-XSR receivers are now coming installed with ACCESS firmware. To bind with ACCST only radios, a firmware update is required. Firmware can be foundhere:https://www.frsky-rc.com/r-xsr/(Select history firmware download for ACCST 1.0 firmware)

FrSky ultra mini receiver R-XSR is the evolution of FrSky full range XSR receiver. The R-XSR is a standalone receiver with all the functions of XSR, in addition, it’s almost1/3 size and 1/3 weight of XSR receiver. Moreover, there redundancy function is integrated into this tiny receiver ensures the security, and the IPEX connector makes itmore convenient to replace antennas.

Specifications

• Dimension: 16*11*5.4mm (L*W*H)
• Weight: 1.5g
• Number of channels: 16CH (1-16CH from SBUS channel, 1~8CH from CPPM channel)
• Operating Voltage Range: 4~10V
• Firmware Upgradable
• Compatibility: FrSky X Series modules and radios in D16 mode

Feature:

• Ultra mini size and light weight
• Support telemetry and Smart Port enabled
• Full range
• Switchable SBUS/ CPPM signal output
• Supports redundancy function
• IPEX connector, replaceable antennas