No Heartbeat Found error in MP

I have Navio 2 connected to a telemetry module through USB port. I am using Mission planner to connect but failed to receive any heartbeat. The lights are solid green which means the mavLinks are connected, everything is running well, and there seems to be no apparent problem. Anyone can help? Can anyone help me troubleshoot the telemetries through sending text from one computer to another, I can’t seem to find any tutorial on the web for it.

Note: I have configured the serial port correctly.