Product Description

PoKeys57CNCdb25 is an USB device and is the smallest of the PoKeys family, designed especially for use with CNC machines with existing LPT (parallel printer) port based control signals input connector. It allows a quick migration from LPT to USB bus. 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 English 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, which can be used to emulate a standard USB keyboard. Digital input pins can be mapped to virtual keyboard and joystick keys. Configuration is simple by using our intuitive graphical PoKeys configuration application, where 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


PoKeys software package contains

– PoKeys configuration software
– PoKeys firmware
– PoKeys communication library
– Manual
– PoKeys USB driver (for fast interface)
– PoBlocks graphical programming environment
– Programming examples for C++, C#, VB.NET, Delphi

PoKeys software can be downloaded in the ‘Downloads’ tab.










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.



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 manual

USB driver, optional
configuration software for advanced features
Latest PoKeys setup package

Mach3 plugin
PoKeys Mach3 plugin with manuals

Related downloads:

User manual
PoKeys57CNCdb25 user manual

USB driver, optional configuration software for advanced features
Latest PoKeys setup package

Mach4 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

To aid developers that are communicating with PoKeys devices on the low-level, the extensive documentation on device communication protocol can be downloaded free of charge from the product webpage.