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CNC4PC     This card provides an easy way of interfacing your inputs and outputs from you parallel port. It provides terminals for the connections and conditions the signals for use in CNC applications.

  • IEEE 1284 Standard compatible. Includes the circuitry recommended by the IEEE 1284 Level 1 standards for bidirectional parallel communications between personal computers and peripherals.
  • Smooth Stepper controller compatible. Includes a pin header to connect directly the SS using a standard ribbon cable.
  • PULL-UP or PULL-DOWN selection for inputs. Includes jumpers to select the best input configuration for your application.
  • Buffered inputs and outputs. Outputs are buffered through the use of high speed and high current buffers allowing the card to output the signals without using the power from the parallel port. It can take the +3.3 or +5vdc signal from the parallel port and deliver solid +5vdc at 24 milliamps.
  • Bidirectional pins 2-9. By selecting the appropriate jumper setting you can use these pins for input or output. If you use a second parallel port and set it to work in a bidirectional way, you get a total of 34 I/O pins.
  • Output pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 16, 17. Or 1, 14, 16, 17.
  • Input pins 10, 11, 12, 13, 15. Or 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15.
  • Input and output pins with close by ground or +5vdc connections
  • The common terminal to pins 2-9 can be ground or +5vdc. Forget about grounding problems. Easily connect your pin by using your close by ground connection. No need to be an electronics expert to ground all your stuff. 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.
  • Input pins 10, 11, 12, 13, 15.
  • External Enable Pin (EN). The board has a pin that allows you to 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. You can use this to enable or disable the system manually, or you can install an external Safety Charge Pump or other external safety monitoring device.
  • Works directly with popular CNC hardware and software. Such as Gecko drive or Rutex, and parallel port control software, such as mach2, Linux EMC, Turbo CNC, and others. (Not all tested).
  • All TTL 5VDC signals. Interface directly with parallel port interface products and other CNC4PC cards. 5VDC (TTL) cards are very common among automation devices.
  • Screw-On connections for all terminals. You only have to screw-on the wires to make all your connections.


On-state voltage range

2 to 5V DC

Maximum off-state voltage


Maximum operation frequency

4 MHz

Typical signal delay




OMaximum output voltage

(5V power supply voltage) + 0.5V

Typical output current


Maximum off-state voltage

0.44 V

Maximum operation frequency

4 MHz

Typical signal delay

10 nS

Time of transition to high impedance state

12  mS*

 This board is a new version of the C10.  Uses the exact same circuits but it is packaged in a different format using SMD components and push-lock terminals. 

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