PMDX-126 with jtechphotonics DAC PWM

[Bx3mE]

Im adding a Laser to my XZeroCNC Raptor.

I have PMDX electronics (126, 107 and 134) for BOB, spindlecontrol and Geckodrives (203V) receiving data from a EthernetSmoothStepper (ESS) and controlled by Mach3.
The DAC PWM is powered from a separate 5V supply which is also used to power the Laser Driver (not yet connected). PMDX is powered from 220V internal supply and ESS is powered from pc-Powersupply. Geckos are powered from an Automationtechnologies Toroidal supply at 56V.

I am now adding a JTechPhotonics DAC PWM, http://jtechphotonics.com/wp-content...nual-V1.13.pdf ,
to my setup using the outputs from the second parallel port (port 2 pin 1,14,16 and 17).

Symptom:
When I in Mach3 click Mist toggle or Flood toggle the outputs in diagnostics view start to blink, the led associated with pin 16 and 17 light up respectively and the led on the DAC PWM lights up but the Laser driver power connector never goes up to expected 5V but stays at 0V.
I would expect the relay to klick but it does not (maybe it is mor silent than I expect).

Investigating the source of the problem...
I disconnect Everything related to the DAC PWM from the BOB (PMDX-126) and check output voltage, 0v at low and 4.3V at high. When I reconnect DAC PWM and measure again it shows 0V at low but only 2.7 at high.

Any Help Greatly appreciated!!

Similar Threads:

• PMDX 122 Rev D
• Newbie- PMDX-126 breakout board will not test motors using PMDX-134 and Gecko G203v drives
• PMDX-340
• PMDX-125 or PMDX-132 for Geckos?

[Bx3mE]

I received great support on PMDX - Support forum!

Short answer provided for reference:

PMDX-126 outputs can drive 16mA max and the DAC-PWM needs 75mA due to Relays being directly driven by input signal. Solution is to put a PMDX 104 in between to drive and protect the 126 from inductive kickbacks from the relays.

TNKS BOB