It is 99.99% linear in both applications. Here is the output for both versus increment. It is imperative that this output is linear for the 256 shades of greyscale will show exactly on your image. 4 P a g eĦ Linearity The Pic-Convert board provides a duty cycle or analog voltage output based on an increment from the step and direction output on your controller. You can see in the next few pictures what the signal to the laser will look like at different power levels. You will learn how to set up what movements will create what power levels in the next few sections of the manual. Movement on the axis will create a signal to the laser to control the power level. Then, control the power with the axis commands. You can use the spindle enable command in mach 3 for this. Now your laser can be controlled ON and OFF with the ENABLE input on the Pic-Convert board. If you use the Z axis, just remember to either disable your motors or take off the motor connections before you run it. You can choose any extra axis your controller has, or you can use the Z axis. Theory of Operation: This board takes the step and direction output of an axis on your controller and turns it into a PWM duty cycle (or analog) based on the position of the axis. To override the output relay, jumper on right two (OVERRIDE). J4: To enable relay control input signals, jumper on left two (Relay Enable). To enable ANALOG output, set to Analog (bottom two) on both J2. 1 P a g eĤ J2: To enable PWM output, set to PWM (top two) on both J2. The inputs are all opto-isolated and can handle up to 24 volts. Set-Up Video Input Specifications The Pic-Convert board requires DC voltage signals for step, direction, and enable pins. Connecting it to a laser driver that uses ANALOG to modulate the laser intensity. Connecting it to a laser driver that uses PWM to modulate the laser intensity. Using the board There are two ways in which to use the Pic-Convert board: 1. Always use caution when operating CNC equipment. When using lasers always make sure you take the appropriate precautions for safety including the use of protective eyewear and shielding. Safety This board is designed to work in conjunction with high power lasers. Contents of the box In the box for the Pic-Convert there should be the circuit board with enclosure and 7 volt 1 amp wall power supply for connecting power. Fully isolated inputs allow for more industrial applications. Output Enable Relay to control output with M03/M05 command. Analog output for analog modulated drivers. Features Convert Step and Direction signals into PWM or analog output for laser drivers. There is also an enable signal to turn the laser on and off. With the board you will now adjust your laser power by MOVING the axis you selected to hook up. This allows software controlled CNC machines (like Mach3) to adjust the laser power on the fly for image engraving applications. This board uses the STEP and DIRECTION signals from a spare axis to output a PWM signal (or analog) to a laser driver for laser power control. This DAC+PWM board solution has been developed with Jeff and John at for use with their picengrave software for laser image engraving. 1 Pic-Convert Board Instructions This is the fifth version of the Pic-Convert board and now has fully isolated inputs and provides a power supply to make the solution completely industrial.
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