The CNCRoom has been manufacturing breakout board series MBx for many years. Now it comes to MB3, the latest version of this series. It has the same form factor as UB1.



Here are the extra features on top of MB2's exist features.


  • New! 18 Universal isolated fast inputs on port 1 and 2. They can be used as NPN and PNP inputs, also able to handle both 5V and 24V. These inputs can detect an index signal of the spinning motor at 862,200 rpm*.
  • New! 5 Universal isolated super-fast inputs on port 3. They can be used as NPN and PNP inputs, also able to handle both 5V and 24V. These inputs can detect an index signal of the spinning motor at 1,710,000 rpm*.
  • 14 NPN isolated output terminals capable of sinking current up to 70mA for each channel and up to 500mA per group.
  • New! - 3 onboard relays with both NO/NC contacts and 2 of them can select “Off Delay Time”, which can be used for such application as “Z Drop Protection.”,
  • The K3 Relay can be controlled by a charge pump signal.
  • New!The Raspberry Pi tall headers are used for firm connection between ESS and MB3 board. This allows ESS to be mounted on MB3 directly without any ribbon cables. This method will eliminate a number of contact points, distance, inductance and resistance between ESS and MB3 board which allows signals go forth and back faster. Furthermore, this makes both companions look nicer and lower in height.
  • Industrial Spring terminals for quicker connecting and disconnecting of cables. They are resistant to vibration, so no more screws which have rattled loose and no more forgetting to tighten.

*Tested on Mach4 by using pulse generator.