Spirit System

The manual shows a configuration, where a RX7 is connected to a W1 unit:

https://manual.spirit-system.com/index. ... _RX_Wiring

Is this configuration meant for a backup receiver configuration? If yes: Does it already work or is it something for the future?

This configuration is meant for doing firmware update.
However same wiring will be used as Backup in near future - for now setup as a Backup receiver is not supported, but firmware update will add this.