This card is designed by our Studio You do not need to add other Hardware,and you can complete the signal conversion from the G-code to the movement of the stepper motor drive control. 19Ĭhapter 1 Overview 1.1Simply IntroductionĭDMMV2.1, which name is short for “Digital Dream Multiple input Mach3 card Version 2.1”is a CNC system based mach3. 5 2.2 Functions and define of each module. 1 1.3 Appearance and size of poduct.2 1.4 Notes and Cautions. Please Log in or Create an account to join the conversation.Chapter 1 Overview. In my case when i set the default ( non iverted )step signals, the motors will turn and change direction as expected and do about 200 rpm, with inverted step outputs the same setup does 1700 rpm easily with no load on the motors.
BUT, you have to have the outputs for STEP set as inverted ( you can do that on Stepconf wizard or by editing the hal file ), also set a longer timing for step length and step space. I agree with Andy on this as i know i have 5V drives connected to 3.3V papraports working without a hitch. Is there any scope for running the input optos from a common 3.3V supply rather than 5V? (In fact I thought that was all that allowed the 3.3V ones to work as parports). That surprises me, I wouldn't expect the parport to be able to sink current when high. When I connect the same LED applying +5v from a USB port to the anode and connect the cathode to pin 2 so that the parallel port is sinking current, the LED illuminates when the pin is low and becomes dim when the pin is high Here's the datasheet for the optocouplers /datasheet-pdf/view/82579/TI/TIL193B.html I'm not very good at reading datasheets for electronic components I'm not even sure if the optocouplers will work with less than 5v, can someone look it over and give me some ideas? Is there any other way to get this thing going or will I have to buy a PCI parallel card that outputs 5v? I'm not an electronics guy, I'm a mechanical guy who has figured out enough electronics to be dangerous, I want to believe that I can put a resistor on the +5v line going to the opto-isolators to drop the voltage to somewhere near 3.3v and things will start working like magic, but I feel like that's not going to work. So after more probing and more head scratching it appears my parallel port is only outputting 3.3v on a high signal, so it makes sense that with 5v applied to the LED there is enough current flowing through the LED to illuminate it dimly. I believe that the LEDs in the opto-isolators are acting like the LED in my test circuit and only becoming dim with the high output signal, the transistors that make up the other half of the opto-isolator never go low so the stepper motors never turn. Unfortunately when I connect the same LED applying +5v from a USB port to the anode and connect the cathode to pin 2 so that the parallel port is sinking current, the LED illuminates when the pin is low and becomes dim when the pin is high, instead of turning off completely. I've confirmed that the parallel port is in fact working, I am able to flash an LED connected to the parallel port between pin 2 and ground (with a current limiting resistor of course) using PTEST. Unfortunately when I connect the board to the parallel port I am not able to get the desired results.
#USB TO PARALLEL PORT CNC DRIVER#
The driver board has opto-isolators, which is really nice and I'd like to use them, the input circuit was well thought out and uses a common +5v so the parallel port is sinking current from the opto-isolators. I thought I had everything put together and was ready to start running the machine but I've arrived at a small problem.
I've done quite a bit of tracing and probing on the Hermes driver board and I have found the step and direction pins for each axis, as well as the limit switch pins. Because the machine was given to me and I don't have a lot of cash to toss around I'm trying to use as much of the hardware that came with the machine as possible, including the proprietary driver board.
I have a Hermes Vanguard 7200 I'm converting to use linuxCNC.