The Line Block was developed to provide a way to send signals over long distances. This is achieved by taking the incoming data, encoding it into digital form, and sending it, together with an address onto the communication lines. Another Line Block with matching address, connected to the same communication lines, will decode the digital data and render it to its output.

The Line Block can transmit two analog and two digital signals. The receiving board turns the analog signals into PWM outputs, and also provides true filtered analog outputs on A0 and A1. The digital signals are sent directly onto the D0 and D1 outputs.