Mach3 USB Motion Board AKZ250V3 NPN(B)[ENGLISH]



THIS is a 3/5 axis Mach3 USB interface board NPN(Ver:B) worked with Mach3.

Download: Installation Manual, Plugin, Schematic



USB Full-speed connection.

Up to 5 axes, 500kHz pulsing engine, which is suitable for the servo or stepping motor. Any one axis can be configured as a Step/Dir Spindle.

2 real-time Manual Pulse Generation(MPG) input ports for 2 MPG at the same time. When the MACH3 MPG is set in the multi-step mode, it has the same real-time performance as the CNC machining center, smoothly. The control board has no delay and the mechanical system performance is fully utilized.

16 general-purpose input, with particular indicators, the input signal states can clearly shows.

7 general-purpose output, It can be configured as: spindle clockwise / CCW / Mist / Flood / VB script programming control.

PWM output*1 channel, 0-10V analog voltage output*1 channel, 0-5V analog voltage output*1 channel. 3 outputs channels are used for spindle motor speed adjustment: PWM pulse width / 0-10V or 0-5V inverter.

2 analog input ports for adjusting the machining speed / jog speed / spindle speed.

Status indicator LED can be useful to show the USB connection, and working stauts by flashing.

5 high-speed optocouplers(Dual Channel) with 10MHz, 25 general optocouplers for isolating all of the input/output signals, this high-cost design can be provided high performance and stable system.

Fully supporting all Mach3 versions, including the Mach3 R3.043.066 version. Supporting Windows series, including Windows XP-Windows10(32bit/64bit).

No need to install any USB drivers, it can be used after plugging in the computer.

Easy firmware update.

Provide a complete installation manual, illustrated, detailed description.




USB interface


5-axis output signal (direction signal + step signal):

10MHz high-speed optocoupler isolation *10 channel


Spindle speed control signal:

Optocoupler isolation 0-5V output*1,

Optocoupler isolation 0-10V output*1,

PWM output *1,

Optocoupler isolation universal output *7


Optocoupler Isolated NPN Input *16 / Power Input




USB cable connection


External Adjustment Knob

Motion control board and PC connection

USB cable connection


Manual: AKZ250V3_NPN(B)_Manual Ver2.0.0 English(ZIP/7.2M) 2021/1/16

Plugin: eMotionMach3(V1.3.0.2).zip(ZIP/0.3M)  2021/4/12


V1.3.0.2 Fix bug: The displayed value(RPM) of the speed measurement is twice as high as the actual speed.

V1.3.0.1 Fix bug: The G code execution line number is incorrect after the RESET(urgency-stop)

V1.2.1.0 Fix bug G31″Auto Tool Zero”

Schematic: Download (ZIP file/0.14M)

Schematic Preview: