I have a fully working telemetry-setup with Pixhawk 2.1 and a plane with standard 3DR 100mW 433MHz-radios.
- The radio on the ground connected to USB.
- The radio in the plane with the cable that came with the Pixhawk 2.1-kit between the Pixhawk 2.1 and the radio with 6 wires (GND, Vcc, Rx, Tx, CTS, RTS).
But when using another radio in the plane that only have 4 wires (GND, Vcc, Rx, Tx) i dont get it to work. I cant get it tto work if I connect Tx from Pixhawk 2.1 to RX on the radio and Tx from radio to Rx on the Pixhawk 2.1. The radios works if I for example connect them using USB to set NetID.
Question: Is CTS and RTS a must?