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How can I activate the vario function in the REX receiver with built-in ASSIST stabilization?

Pair the ASSIST receiver with the DC/DS transmitter. In the transmitter menu, locate the "Device Explorer" and enter the receiver settings, the Info item. In this menu you will find the "registration code", which you will use during the registration of the receiver at the swshop.jetimodel.com website. The receiver has to be at least FW version 1.10 or later.
How to correctly connect a backup receiver to the REX receiver via EX Bus serial line.

Pair both receivers with the DC/DS transmitter in the Double Path mode (or set the backup receiver to CLONE mode). All REX receivers are equipped with fully adjustable inputs E1 and E2. Select for one of these inputs in the settings EX Bus input/backup (min. irmware version REX 1.13 and REX Assist 1.12). In the main receiver you can set Fail-Safe for servos (we recommend at least lowering the throttle down). In the backup receiver please disable Fail-Safe function and set up the output to EX Bus mode.
For the Rsat2 satellite receivers the EX Bus signal is generated at the Ext. output. On the contrary, the Rsat900 receivers are equipped with fully adjustable E1 and E2 outputs.
Connecting the REX Assist receiver in case multiple receivers are used

If you plan to use the REX Assist receiver in combination with any additional receiver or Central Box, this article provides you several possibilities of how to connect and set up the devices.