The TXL2 transmitter and RXL2 receiver modules, from London-based wireless solutions developer Radiometrix, are half duplex multi-channel OEM radio modems offered in a SIL standard footprint. Operating in the European license-free 433 MHz ISM (Industrial Scientific and Medical) frequency band, with a choice of 5 user programmed channels, these products can be employed to form transparent one-way radio data links supporting data rates of 9600 bps over a line-of-sight range of 500 m (typical).

These modules take care of preamble, synchronisation, bit balancing, error checking, and noise squelching, as well as all transmit timing, valid data identification and datastream buffering activities. This allows a data link to set be set up with the minimum of engineering effort. Each module can be assigned 1 of 8 unique addresses, so that a multiple radio link network can be established, provided no two modules are attempting to transmit at the same time on same channel.

The transmitter has an output power of 10 dBm (10 mW), while the receiver has a sensitivity of -107 dBm. The modules require a 5 V power supply, drawing just 28 mA for transmitting and 22mA for receiving. They have an operating temperature range of -20 °C to +70 °C.