The M48-169-BiM1H presents M48 modem IC combined with a BiM1H radio module and suitable interface circuits, power supplies, connectors to provide a complete RS232 radio modem interface. Optionally, the board can be housed in an EAS80 extruded aluminium housing. In the simplest case, a pair of these units (with suitable aerials and power supplies connected, of course) can be connected directly to the serial ports of a pair of industrial PCs and the resulting wireless data link used without any further installation or programming.