[Communication interface]：UART

[Transmission power]：30dBm

[Communication distance]： 5.6km

[Modulation method]： GMSK/4FSK

[Introduction]：RD400D is a table mounted built-in fixed-frequency transceiver-transmitter data transmission module (radio), working in the 410MHz~470MHz frequency band, focusing on surveying and mapping, precision agriculture, drones and the Internet of Things The application environment has the characteristics of light weight, small size, low power consumption and superior reception performance. It supports a variety of power gear selection, free switching of air baud rate, rich serial port baud rate selection, and easy operation.
Support for TRIMATLK, TRIMMARK3, TRANSEOT (OR PCC OR TRANSPARENT PROTOCOL).