PBX-USB

Hardware Features:

4 axis USB CNC controller
USB (V2.x) from PC/Laptop running Windows XP, Vista or Windows 7(32 bit or 64 bit)
3 digital outputs (flood, mist, spindle)
25 KHz maximum step frequency
12us minimum pulse width
Buffered I/O for maximum performance
Two manual jog input keys per axis (8 total)
Two limit switches for X,Y, Z (6 total)
Jog Pendant Interface ?Relay Board Interface
I2C Interface
E-Stop Loop

Software Features:

Advanced interpolation algorithms
Control external devices with I2C protocol
Pause/resume of execution supported
Automatic homing procedure
Touch Plate Tool Change Procedure
Standard RS274/NGC G-code (EMC2 compatible)
Toolpath simulation
Advanced G-codes - G40, G41, G42 (Cutter Radius Compensation) supported
Advanced G-codes - G43, G49 (Tool Length Offsets) supported
Advanced G-codes - G54, G59.3 (Coordinate System Origins)

Description:

The PBX-USB is a USB interfaced CNC controller that was developed specifically to work with the CNC USB Motion Controller Software from www.planet-cnc.com. This Interface sports 4x 10 pin PBX-Header Connections for interfacing to our existing stepper motor drivers. It has an additional header for direct connection to our RBX-1 3 channel relay board. This software/hardware combination can be further expanded with jog key inputs and an I2C bus for nearly unlimited additional I/O. This will allow the development of jog pendants, digital readouts, and input/output cards for a variety of purposes. The software runs on Windows and replaces Mach3 or EMC2. It can even be run through a virtual machine on a Mac or Linux host.

Diagram:

Figure 1: PBX Header

Figure 2: I2C Header

Figure 3: Pendant Header

Technical Details:

JP1	Vin - Powers micro-controller from 5V derived from Vin Vusb - Power micro-controller from USB (recommended)
POT	Pie
E-stop Loop	The E-stop loop is a normally closed circuit which loops through the 16-pin pendant header and the e-stop loop screw terminals. Any open condition in the loop will cause an e-stop. If e-stop switch(es) are not used, the circuit must be closed with jumpers. A small peice of wire will suffice to close the screw terminal loop.

Jog Inputs - The jog inputs can be used to make a simple jog pendant. Normally open push buttons connected to the jog inputs and the adjacent +5V connections will do the trick.

Limit/Home Inputs- Normally closed limit/home switch loops. You can use a single input for both + and - switches, or separate switch inputs for + & -. The LZ- input is used for the tool length compensation touch plate.

Aux Outputs - The spindle, mist, and flood outputs come out to the relay board header for direct connection to our RBX-1 relay board. Those signals are also replicated to the screw terminals for connection to other devices. The signal output cannot exceed 20mA or the micro-controller will be damaged.

I2C - Currently the I2C interface suports Spindle (M3, M4, M5), Coolant (M7, M8, M9), general purpose outputs (M62, M63, M64, M65), as well as current machine position.

Notes: