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#Parallel port cnc breakout board wiring drivers#
The PBX-RF utilizes our standard PBX-Header IDC connectors for easily connecting to our drivers and other peripherals. Be sure to disconnect JP6 when using the USB supply.
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The PCs USB ports can supply 5VDC at 100mA without needing to enumerate. The easiest way to drive this side of the board, however, is by connecting it to a USB connector of the host computer. The PC side can be supplied with any DC power supply from 12 to 40 volts capable of at least 100mA. The isolation chips require power supply on both sides of the isolation circuitry. These inputs are typically used for limit and home switches, touch probes, and emergency stop interrupters. The other 5 signals are configured as inputs. Twelve of the signals are available as outputs to control motors, relays, or other devices. It is functionally equivalent to the non-isolated version - the PBX-2. The PBX-RF breakout board splits the 17 available signals from the parallel port so that they can be accessed. The RF isolation chips used in the PBX-RF work much like opto-isolators, except that they use radio waves to send signals across the isolation plane rather than light.
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The isolation layer protects the PC from potential damage from spikes or short circuits on the high voltage motor drivers used in CNC. It is compatible with a variety of Parallel Port CNC Control Software. The PBX-RF is an Isolated Parallel Port Breakout Board designed specifically for Hobby CNC machines.