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Introduction

The PII CMB V2 is a CNC breakout board for the super powerful Teensy 4.1 control board, running the equally powerful GrblHAL firmware. The PII CMB V2 supports the following features:

• 4 Axis Control with standard STEP/PUL, DIR, EN Pins, all supporting +5V Logic Levels.

• Fully Isolated inputs for all Axis Limits and Control Signals with selectable voltage levels and LED indicators.

• +12V or +24V Power Supply Connection with reverse connection protection, and power regulation onboard meeting Class A EN 55032 Emission requirements.

• 0-5V, 0-10V, 4-20Ma, or +5V PWM Selectable Spindle Speed Control Output.

• Spindle Direction Control with Spindle Enable Control all supporting +5V Logic Levels.

• FLOOD, AUX0, AUX1, AUX2, capable of sinking 400mA each with selectable Onboard LED indicators. (Used for relay control.)

• High-Speed Isolated Spindle Pulse/Index for feedback.

• Fully buffered External I2C interface at +5V Logic Levels with STROBE input pin available for external keypads. (Up to 6ft)

• I2C Onboard Temperature Sensor with Over/Under Temperature ALERT LED indicator.

• USB Host Interface Capable via an onboard USB A connector. (Keypads, Gamepads, Etc.)

• Ethernet 10/100 Interface Connectivity.

• Peripheral interface for Bluetooth/WiFi modules with onboard activity LED’s, and reversible RTS and CTS pins.

• Isolated Half-duplex RS485 interface with Auto direction, onboard ability to break isolation, and onboard activity LED’s.

• I2C 16kB EEPROM/FRAM memory onboard. (OPTIONAL)

• 3V Battery connector (JST-PH) for retained memory. functions (OPTIONAL)

Definitions/Capabilities:

Axis Stepper Driver Control Outputs:

Stepper Driver Outputs Include +5V Step/Pulse for X, Y, Z, A-Axis, +5V Direction Control Signals for X, Y, Z, A-Axis, +5V Enable Control Signals for X, Y, Z, A-Axis. All buffered for driving most stepper driver boards. Onboard Y-Axis and A-Axis teaming selection available for dual motor Y-Axis machines.

Axis Limit Inputs:

Limits for X, Y, Z, A-Axis all opto-isolated for protection from external transients, +5V or +12V input selectable. All Axis Limits include an LED indicator showing when tripped as well as a dedicated screw terminal block and reverse connection protection.

Estop/Probing Inputs:

PROBE & ESTOP are all opto-isolated for protection from external transients, +5V or +12V input selectable. PROBE & ESTOP each have an onboard LED indicator showing when tripped. Dedicated screw terminal block for ESTOP & PROBE inputs. Also, reverse connection protection for each.

GRBL Standard Control Inputs:

Dedicated FEED/HOLD & CYCLE/START Inputs are all opto-isolated for protection from external transients, +5V or +12V input selectable. Each function has a dedicated LED indicator showing when tripped, as well as a dedicated screw terminal block and reverse connection protection.

Spindle Control I/O’s:

Dedicated Spindle Control screw terminals include: +5V Spindle Enable Output, +5V Spindle Direction Control Output. Spindle Speed Control via selectable 0-5V, 0-10V, 4-20mA, or +5v PWM output modes. Spindle Feedback via High-Speed Isolated and filtered A / B, & INDEX input pins.

CMB Board Power Supply(s):

+12V thru +24V power supply input with reverse voltage protection with onboard +5V (2A) and selectable +15V (0.5A) power regulator, all meeting EN 55032 Class A Emission requirements. All power supplies/inputs have dedicated LED indicators. Onboard +3.3V LDO for CMB functions only. Optional onboard JST PH-Series 2 Pin connector for 3V Battery connection for retained memory functions.

USB A Host Interface:

USB A connector onboard for future Host interface connections, powered thru the Teensy 4.1. Has onboard current protection PPTC resettable fuse to 350mA.

Ethernet 10/100 Interface:

Ethernet 10/100 interface for communication with the CNC machine.

Teensy 4.1 micro-USB Interface:

Teensy 4.1 micro-USB interface for communication with the CNC machine as well as programming of the Teensy device.

Serial Interfaces:

Separate Bluetooth/Wi-Fi and Isolated Half-Duplex Auto Direction RS-485 serial interfaces. The CMB includes a pin header compatible with standard HC-05 Bluetooth modules. RS-485 serial interface is completely isolated from the CMB, with the option to break the isolation onboard. It also works at +5V logic levels. RS-485 has a dedicated screw terminal block. Both interfaces have onboard LED indicators for TX & RX activity.

I2C Interfaces:

I2C interface has a buffered interface which extends the I2C interface externally at +5V logic levels for longer signal integrity levels. It also includes a STROBE input pin for keypad connections that require it, also at +5V level. The external I2C interface has a dedicated screw terminal block. I2C bus includes an Optional 16kB EEPROM/FRAM for data logging, an onboard Temperature sensor with ALERT LED for monitoring the working environment of the CMB and Teensy 4.1, and a standard input MUX with interrupt for receiving the ALARM pins of the motor drivers.