What does it do?
The module allows wireless transmission of serial port data. The connectors on the module are a TTL-Level (5Volt) serial port and the 5Volt power supply for the module.
The module will transmit wirelessly the data it receives on the Rx input line. And data received by the module will be sent out the Tx line.
The module supports baud rates of 4800, 9600 and 19200 bit/s. 256 individual channels can be selected.
Now, the really interesting part is that this module also supports point-to-multipoint transmission. This means that, when one module is transmitting data, *all* other modules that are on the same channel and within range will receive the same data.