C4- Safety Charge Pump

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C4- Safety Charge Pump


This board takes advantage of Mach ability to send a specific frequency through one of the pins of the parallel port when the program is in control of the system. CNC machinery can be very dangerous, and you could have a risk of the machine doing something different that what you intend the machine to do if the program loses control of your system. Mach can be programmed in a way, so when it is “in control”, it delivers a 12.5 KHz signal through one of the pins. This card lets you use this signal to work as an On/Off switch for your system, enabling a powerful safety system for your equipment.


  • Takes advantage of the 12.5 KHz signal from Mach. When Mach X is in control it can emit a 12.5 KHz signal that can be used as an On-Off safety switch for your system.
  • Microcontroller based system. New since revision 5 of this board. They now come with a microcontroller that allows the implementation of more complex algorithms for sampling and analyzing the signal.
  • TTL compatible. 5V and 3.3V signal can be connected to the pulse input.
  • You can use it to control your Parallel Port Interface Card or any other device that can control your system. This device acts as an On/Off switch for your system. When hooked up, you can control what is powered or not.
More Information
User manual C4 rev6.2
(Size: 778.5 KB)
Wiring Sample C4 rev6
(Size: 673.7 KB)
User manual C4 rev7
(Size: 612.7 KB)
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   Frequently Asked Questions and Answers

  • Arturo Duncan - 8 months ago
    What is a Safety Charge Pump (SCHP)?

    It is a watchdog.  It is a feature in which the control software will send a pulse stream through a pin, as if it was moving an axis.  Then a microcontroller on the breakout board will see that pulse stream and will know that the signals coming f...
    Read more

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