Shaluoman Mini CC3D Revolution Universal Transceiver TX RX Module Remote PPM input When you first try to use your OPLM with the GCS, it will not be automatically picked up by the GCS. The OPLink is a radio transceiver backed by an ARM32 powered digital packet processor specifically designed for the OpenPilot project, it was originally developed under the codename PipXtreme and there are many artifacts that still reflect this. It is a two-way radio system allowing real time telemetry information for the Ground Control Station, Wireless Configuration and even radio control from your transmitter over a single communications link. You will need two OPLink radios to establish a connection between the vehicle and ground station. Note that the Revolution board has an OPLink built into the flight controller. The same firmware version must be running in Revo and OPLM devices (i.e. if you upgrade one board, you will need to upgrade all others that are 'bound' together).