Point-to-Point/SIK Firmware User Manual
3 Software/GCS Support
This firmware is a development of the open source project called “SiK” that was created by Mike
Smith and further developed and modified by Andrew Tridgell and RFDesign.
The modems feature a boot loader to facilitate field upgrade of the modem firmware via the serial
port. This is most easily performed by using the latest version RFD Modem tools (see “Useful links”)
Parameters such as power levels, air data rates, serial speeds, GPIO pins etc can all be custom set by
using the AT Command set, the RFD Modem Tools and APM Planner.
Default serial port settings are as follows:
• 57600 baud
• No parity
• 8 data bits
• 1 stop bit
The Point-to-Point/SiK firmware has many software features including:
• Frequency Hopping Spread Spectrum
• Transparent Serial Link
• Configuration by AT commands for local radio, RT commands for remote radio
• User configurable serial data rates and air data rates
• Up to 256 bit AES hardware encryption with user settable key
• MAVLink protocol framing (user selectable)
• MAVLink radio status reporting (Local RSSI, Remote RSSI, Local Noise, Remote Noise)
• Automatic antenna diversity switching on a packet basis in real-time
• Automatic duty cycle throttling based on radio temperature to avoid overheating
• PPM or SBUS (R/C signal) pass through (Control vehicle across radio).
• GIPO pin mirroring
• External lock LED mirror
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