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USB CNC Controller – PoKeys57CNCd25 for Mach3 or Mach4

PoKeys57CNCd25, One Year Warranty


There are a lot of older CNC controllers with only LPT (parallel printer DB25) port based control signals input connector. PoKeys57CNC is an USB CNC controller Connecting with  LPT port( DB25).  Although small, the device is adjustable and as such requires no complex knowledge on device programming.

PoKeys57CNCdb25 can control up to 4 STEP/DIR signal driven motors (stepper motors, servo drives, etc.) in various applications. The device features 12 digital outputs and 5 digital inputs in total. Four of the digital outputs can be configured to operate as PWM (pulse-width modulated) output.


  • Compatible with USB 1.1/2.0 HID standard,
  • standard USB keyboard simulation (with triggering support for up/down keys),
  • 12 digital outputs (8 are used for step/direction output signals)
  • 5 digital inputs with pull-up resistors
  • high performance 4-axis 125 kHz pulse engine,
  • up to 4 high-speed fully configurable PWM outputs (25MHz PWM timer)
  • fail-safe support in case of communication interruption,
  • intuitive and user-friendly software,
  • third-party support via communication DLL library and extensive protocol specification document that allows porting to other systems.

PoKeys USB products integrate support for virtual USB keyboard and USB joystick. Emulation of the standard USB keyboard is integrated. Digital input pins can be mapped to virtual keyboard and joystick keys. Configuration is simple by using our intuitive graphical PoKeys configuration application.  Above all each function can also be tested.


  • USB connection between host computer and PoKeys57CNCdb25 device
  • Included software requires Windows 2000/XP/Vista/Windows 7/8/10 with .NET framework 3.5 installed

Tutorials and instructions on using PoKeys57CNCdb25 with Mach3 and Mach4

PoKeys57CNCdb25 is compatible with Mach3 and Mach4 CNC software. Check the instructions below on how to prepare the PoKeys57CNCdb25 device for CNC operations.

Mach3 Mach4

PoKeys57CNCdb25 with Mach3

Mach3 tutorial with PoKeys – first steps

Mach3 setup tutorial – first movements

Mach3 limit switch tutorial with PoKeys

PoKeys57CNCdb25 announcement and Mach4 setup

Mach4 CNC Controller Software with PoKeys

Mach4 motion controller – PoKeys57 CNC

Mach4 tutorial – Custom signal mapping

Related downloads:User manual
PoKeys57CNCdb25 user manualUSB driver, optional
configuration software for advanced features
Latest PoKeys setup packageMach3 plugin
* included in the PoKeys setup package
Related downloads:User manual
PoKeys57CNCdb25 user manualUSB driver, optional configuration software for advanced features
Latest PoKeys setup packageMach4 plugin
PoKeys Mach4 plugin with manuals

Check also the following blog posts:

PoKeys tutorial – getting started with PoKeys57CNC
USB CNC controller by your needs
5 reasons to switch your CNC from LPT to USB
DIY vacuum table tutorial
PoBlocks tutorial – Pulse engine, custom PoIL code
Auggie – CNC machine controller software for PoKeys

Support for PoBlocks graphical programming software

Third-party application developers that are adding the support for PoKeys devices, are encouraged to use the supplied communication DLL that can be simply used in the different .NET framework based applications and various other programming languages that provide support for ActiveX interface. There is even an open-source cross-platform C library available at

For developers who wants to communicate with PoKeys directly, extensive documentation about device communication protocol is avaiable for download free of charge from on product webpage.