This card has been designed to provide a
flexible interface and functions to your computer projects, by using the
parallel port control software. This board provides a faster way to connect
devices and reduce the possibility of wiring errors.
Fully optoisolated The card isolates connections to protect
your computer from short-circuit. An opto-isolator is an integrated
circuit that transmits the signal through an encapsulated LED and
phototransistor. When the signal is on, the LED lights up, the
phototransistor captures it and relays the signal. In that way, your
computers electronics are completely isolated from the cnc circuitry.
The signals are transmitted through light and not through physical
connections. In this way, a power surge has no way of reaching your
computer. That is the reason why this card has two power connections.
One power connection is power powering the circuit that interacts with
the PC, the other connection is for powering the circuit that interacts
with your cnc system. Extra precautions have been taken when designing
this circuit, by taking into consideration the extremely high voltages
that stepper drivers can achieve and lack of experience that some users
could have in wiring circuits of this kind.
Buffered outputs. All inputs and outputs are buffered through
the use of high speed and high power buffers. Each pins deliver 24
PULL-UP or PULL-DOWN selection for inputs. Includes jumpers to select the best input configuration for your application.
IEEE 1284 Standard compatible. Includes the circuitry recommended by the IEEE 1284 Level 1 standards for bidirectional parallel communications between personal computers and peripherals
The common terminal to pins 2-9 can be ground or +5vdc. The
board has a jumper that allows you to select if the common terminal to
pins 2-9 will carry a ground or +5vdc. So if you are connecting encoders
or proximity switches, you can select it to ground. If you are
connecting Geckodrives or limit switches, you can set it to be +5vdc.
Support for up to 1MHz optoisolation on step and direction signals. New on this revision is that the optoisolation circuit has been optimized and now supports full optoisolation at speeds up to 1MHz.
All pins can be used in a concurrent manner. You can use all
the input or output pins in a concurrent manner. For example, if you are
using output pin #1 to control the Built-in Solid State Relay Board, you
can also access that signal from the output pin on the board or from the
DB25 connector for output. Each connection will not affect the other
current from the other connection.
Built-in Passive Low Pass Filters for the all signal. This board includes low pass filters to reduce the effect of the noise from the drivers or other devices over the signals.
External Enable Pin (EN). The board has a pin that allows you
enable/disable all the outputs at once. The board requires +5vdc in the
EN pin. If it is not present, it will send all the outputs to ground
immediately. You can use this enable and disable your system manually,
or you can install an external Safety Charge Pump or other external
Status LEDs on all inputs and output connections. No more
guessing. You can SEE all your signals. Save valuable time and
brainpower for cncing.