Vermes
Advanced Member level 4
It is an adapter for Telecontrolli modules RXQ2-XXX, which can be used to exchange data with a device at a distance of 100m and provide .bidirectional transmission with adressing the receiver and the frame. Adapter was built to communicate AVR processors. It is based on AVR microprocessor. Built in microprocessor in RXQ2-XXX uses GFSK modulation and Manchester coding, what provides range up to 200m and the transfer of 38,400 kbps.
A problem you can face is the difference of voltages (AVR supplied by 5V and RXQ2-XXX 3,3V). Stabilizer of the adapter was based on popular system LM2951 which does not require the difference of input and output voltage. Voltage converters are N-MOS BSS138 transistors. Zener diode 3,6V protects the system against possible overvoltages. Note that RXQ2-XXX requires to be programmed. The application for this purpose can be found at the manufacturer's website. Before programming, the system should be correctly configured. Dil-switch should be set in CONFIG mode and line RTS should be shorted to the ground. When the programming is complete, set the same speed of transmission on both sides and enable CONFIG mode. All data required for the configuration are available in the note sheet.
Below there is the diagram with the rendered board and picture of the adapter.
Link to original thread (useful attachment) – RXQ2-XXX: Adapter-konwerter