C11G - Multifunction CNC Board

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This breakout board has all the features for a basic 4 axes machine with spindle control.  It has been designed to provide a flexible interface and functions to your computer projects by using the parallel port or USB-based or Ethernet-based controller.


This card has been designed to provide a flexible interface and functions to your computer projects by using the parallel port or USB-based or Ethernet-based controller. This board comes as a response to many customers that have been asking for a faster way to connect devices and reduce the possibility of wiring errors.


  • IEEE 1284 Standard compatible.

  • PULL-UP or PULL-DOWN selection for inputs.

  • Buffered inputs and outputs.

  • Microcontroller based SCHP.

  • Built-in Variable Speed Control.

  • Electromechanical Relays with NO and NC positions.

  • Status LEDs on all inputs and output connections.

  • Output pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 16 and 17. • Input pins 10, 11, 12, 13 and 15.

  • Input and output pins close to ground or +5vdc connections.

  • Common terminal for pins 2-9 can be ground or +5vdc.

  • External Enable Pin (EN).

  • Works directly with popular CNC hardware and software.

  • All TTL 5VDC signals.

  • Screw-On connections for all terminals.

  • All pins can be used in a concurrent manner.



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Documents and Download

Product Manual

Software, Installers and Configuration Files

Wiring Information


Old Documents

   Frequently Asked Questions and Answers

  • Arturo Duncan - 4 years 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 from the c...
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  • ArthurSchrock - 4 years ago
    how to add spindle control to vfdhow to add spindle control to c11g board?

    You can find several wiring diagrams for different VFDs and Speed Controllers in the Product Download section of the C11G: https://www.cnc4pc.com/c11g-multifunction-cnc-board.html#pattachments. Please choose one that may match the VFD you have. You can ...
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  • GlenMorr - 4 years ago
    I have a Seig FC350BJ/110V spindle drive on a X2 Harbor Freight mill. I am interested in buying the C6 board to allow Mach3 control of the spindle. Do you have wiring diagrams and Mach 3 configuration notes on how I can use the board? Thanks

    It is ideal to use a breakout board that has the spindle control circuit built-in and that uses a Safety Charge Pump.  This will greatly simplify your wiring and using a Safety Charge Pump when wiring your system delegate starting your spindle to the...
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  • Arturo Duncan - 3 years ago
    I cannot get the green LED to enable on the breakout board

    3 conditions must be met to get the enable LED:   The board must be properly powered.  Check the documentation on the board, as a misunderstanding on how it is powered is very possible. The board must be connected to a PC/Motion Controller which is c...
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  • Arturo Duncan - 3 years ago
    US and International modes of operations for VFDs (Variable Frequency Drives) and Speed Controllers

    VFDs and motors have two way of operation, in the US we use CW and CCW, in the rest of the world, or INT (International) it is used START/STOP and DIRECTION. These settings can usually be adjusted VFD settings.  The chances are that if you purchased the V...
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  • Robin - 2 years ago
    I am look at your touch probe, will this work on a c11G board if yes please send information. Thanks

    Yes, the probes can very easily be wired to the C11G.  The probes ship with a female jack connector that can be connected to the terminals of the C11G.  the C11G has a jumper to set the input to be set to pulled-up.  If you have any issues ...
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  • Robert Barrett - 1 years ago
    Do I have to have a USB/DB25 cable or can I use a DB25/DB25 cable without the USB connector? I am replacing a breakout board on a 3 axis router table. No extra features except for emergency stop. Using Mach3. Thanks. R. Barrett

    The UC100 is what you are looking for: https://www.cnc4pc.com/uc100-usb-motion-controller.html It will work very well with any standard parallel port.
    Read more

  • Jim Smith - 1 years ago
    Do I need stepper motor drivers? or is this integrated on the board? I currently use the UC400 ETH and am looking to replace my control board.

    C11G is a very good option to be used with the UC400ETH. But the C11G does not have built-in Stepper Drivers. You may want to check the C85 as it may be a better option if you need built-in Stepper Drivers: https://www.cnc4pc.com/multifunction-4-axis-d...
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  • Robert Barrett - 1 years ago
    According to the manual, a 12/24v power supply is used for the proximity switches. Th e video on the C11G does not use an external power supply and the manual also shows a resistor being used (not in the video). Just a little confused.

    To use voltages above +5vdc you use a limiting resistor, as the C11G can only take +5vdc signals. It is described in the manual. I am not sure what video you are referring to, but you are welcome to open a ticket and we will give you a hand with this:...
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  • Arturo Duncan - 1 years ago
    The Analog Output to the VFD is not stable

    The issue is related to noise coming back from the analog input terminals on the VFD. They are supposed to be isolated, but sometimes noise finds a way. There are two ways of fixing that: - Use shielded cables for the analog and its ground and ground the...
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  • Tyrone O Small - 1 years ago
    What Window OS am I to used for motion control with this board?

    The C11G requires you use a motion controller. If using Mach3, you can use the Parallel Port as a motion controller over Windows /32. We recommend using the UC100 or Ethernet Smooth Stepper on Win10/64.
    Read more

  • Bjørn Ove - 11 months ago
    can you use this to drive servo drives??

    You could, but you could probably be better off using a C76 or C82 as they can connect to the servo fault and enable signals.
    Read more

  • Arturo Duncan - 6 months ago
    How does the Spindle Control work on the CNC4PC Multifunction Breakout Boards

    The relays are not directly tied pins in the configuration, as it is the breakout board that is driving the relays based on the step(PWM) and dir received from the controller and the US/INT Mode selected to drive the spindle. Please check this: https://ww...
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  • Arturo Duncan - 3 months ago
    Using Relays 1 and 2 as General-Purpose Relays

    Relays 1 and 2 are intended to be used for controlling the VFD or Speed Controller and are intended to activate the FOR and REV signals (US MODE) or the ON/OFF and CW/CCW (INTernational MODE).  But if you do not need to control the VFD, but intend to...
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