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900ux Radio Documentation
There are two options to configure the radio. I will use AT&M commands over a terminal, because I do not have ready access to a Windows laptop.
See the Sofware Manual link for more documentation.
- Connect FDTI-USB cable to modem & laptop
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Connect to the Radio
i. Determine the device COM port
List all active connections:
ls /dev | grep ttyUSB
If it is not obvious, try unplugging the modem, running the command, then plugging it back in and rerunning it. There should be a new device, which is the modem. The first time we did this, the device name was ttyUSB0.
ii. Connect Over Serial
Default Configuration Settings:
57600 baud rate, no parity, 8 data bits, 1 stop bit
screen /dev/<device_name> 57600
Note: If screen is not installed, install it with:
sudo apt install screen
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Configure Using AT&M Upon successful connection, you should be greeted with a blank screen.
i. Type
+++
to enter AT modeii. Type
ATI
to list the current firmware version. Ensure it is up to date.iii. Type
ATS3?
- This will display the currently set up network ID. It defaults to 25.iv. Type
ATS3=10
- This will set the network ID to 10. By using a non-standard value, we reduce the risk of interference if another team is also using this type of radio.v. Type
AT&W
to write the current parameters to EEPROMvi. Type
ATO
to exit AT mode -
Ensure Parameters Have Been Implemented
i. Repeat the above steps for the other modem(s)-- they must all have the same network ID to function correctly
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Test Connection
i. Power on the drone by connecting a battery
ii. Plug the air-side transmitter into the telemetry-1 port of the Pixhawk using the provided cable. It should be attached to the bottom row of the transmitter pins as shown below.
iii. Plug the ground-side transmitter into the basestation computer as before.
iv. Once both are power on, you should see a solid green light, and a blinking red light on both modems.