ToslinkCNC has been developed for use with GoodenoughCNC Plasma cutter as our answer to continuous problems with electrical noise and interference. Our design is based on Serializer / Deserializer for Audio Fiber Optic project published on Open Cores. Moreover, because of the inherent design of optical transmitters and receivers, serial data must also be Manchester encoded. For successful transfer via optical fiber the first thing that must be done is to convert parallel data to serial bit stream. Because of this we decided to design an interface to transport these parallel signals via an optical link. Parallel bus on longer distances and in noisy environment can be susceptible to electromagnetic interferences. In addition to these six signals, there can also be other general purpose control signals. At each positive edge of the STEP signal, the corresponding stepper motor moves into direction set by DIR signal. For each of the three axes there are two signals: STEP and DIR. CNC machine is usually controlled via parallel bus, containing six signals.
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