This is a basic breakout board. It provides screw-on terminalsto pins 1-17 and ground of the parallel port. It comes with a females DB25 connector. Pins 18-25 are connected ground.
This card does not provide any kind of signal conditioning. It does not have buffers, optoisolators, capacitors (for absorbing noise), or pull-down resistors. It is for use with devices that do not need signal condition, such as other cnc4pc boards.
Do not use this board for wiring Geckodrvies, these drives require 16 milliamps signals, the parallel port can only deliver 10 milliamps. Using this board for these drives can cause lose of steps and unreliable operation.
All TTL 5VDC signals. Interface directly with parallel port interface products and other CNC4PC cards. 5VDC (TTL) signals are very common among automation devices.