The wTunnel radio system provides a point to point wireless connection between two units. Each unit has 1 Serial RS232/485/USB port, 2 Analogue Inputs (0-10 and 4-20mA), 2 Digital Inputs and 2 Digital Outputs. Serial ports will operate as transparent serial port allowing two serial devices to connect over the wireless connection. The Digital Inputs and Outputs will match those on the other unit and the Digital Outputs can be configured to switch on/off at specific Analogue input limits.