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Question #: 14356

Question: parallel break out board is not working-relay keeps switching my computer off when I power up

Current Solution

Do you have anything connected to the relay?

Additional Information:
is the relay controlled by a pinout on the BoB?

Additional Information:
Nothing is attached to the relay pins I am only using 2 and 3 and 5v for x driver and led indicator, 4 and 5 and 5v for y driver and led indicator, and 6 to fire the laser and the led indicator. I am also using a 5v out for the laser power control circuit and one pin of the 5k pot. Ground is shared on the laser power supply, the cnc power supply and the x and y driver. I am using the computer motherboard supplied by Buildyoucnc running ubuntu 12.04.5 LTS and linuxcnc. Bios is set to use ECP, I have tried normal and I have tried EPP, all with the same results. If I plug in the parallel after the computer starts up it doesn't switch but I can't control either axis motors


Additional Information:
Laser is currently not connected for safety reasons


Additional Information:
I am using the parallel BoB for the 40 watt C02 Laser Cutter and Engraver(blacktooth), with the supplied integrated computer running Ubuntu 12.04.5 LTS and linuxcnc. Right now, when I have the parallel header connected to the BoB(as well as usb power supplied by the computer) and I start the computer, I am able to see the first splash screen of text indicating that the computer is starting up, then the relay on the BoB switches, turning the computer off and then back on again. This happens over and over again and the computer cannot fully start into the linux os. If I unplug the parallel cable from the BoB, I can start the computer, sign in and then plug the BoB back in without it shutting down the computer. Can anyone explain why this happens? I should also say that I cannot talk to the steppers in stepconfig of linuxcnc, I get to the test this motor section and nothing happens when I try to jog either the x or y motors. In the y config, I actually triggered the relay and sent the machine back into the start up failure loop I mentioned in the beginning.

Additional Information:
Fixed this problem, the parallel cable was not seated well, found some screws to make a strong connection, now that part is working. Unfortunately, the stepconfig in linuxcnc is still not talking to the motor drivers and the setup for determining steps for inch in the build instructions is nothing like the set up in linuxcnc. In the instructions it says motor steps per revolution*microsteps/pulley pitch per tooth*number of teeth and in this case the recommended input would be (200*16)/.08*20 teeth = 2000 steps per inch the formula in linuxcnc is very different

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Other Possible Solutions to this Question

  • MY COMPUTER DOES NOT HAVE A PARALLEL PORT. HOW DO I INTERFACE WITH THE BREAKOUT BOARD?

    If your computer does not have a parallel port, all you will need is a low cost PCI parallel adapter card (these can be found on amazon for $15-$20). If you plan on using a laptop (not recommended) you can try to find a PCMCIA parallel adapter, but many people have frequent issues with this setup. A more expensive solution would be to purchase a USB smooth stepper board. Unfortunately, we do not supply any of these adapters and cannot attest to their reliability.

    Additional Information:
    ur gay

    Additional Information:

    Click the link to add information to this solution:
    MY COMPUTER DOES NOT HAVE A PARALLEL PORT. HOW DO I INTERFACE WITH THE BREAKOUT BOARD?

  • My computer doesn't have a parallel port connection. Can I use a usb to parallel port cable to communicate with my breakout board?

    A parallel to USB adapter will not work. You will need to use a USB interface like the ones below:

    Mach3 USB interface:
    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    Poeys57CNC Interface:
    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach4-mach3-USB-ethernet-Board

    Additional Information:
    To answer the question in more detail, the parallel port is actually an extension straight from the CPU and is also called the GPIO (General Purpose I/O) pins. These pins carry signals independently, hence the description as being a parallel port.

    The stepper motor driver receives a pulse train (series of pulses). A single pin on the parallel port sends a pulse train to one stepper motor driver and stepper motor for a single axis. Another pin on the parallel port sends a pulse train to another stepper motor driver on another axis. This happens simultaneously as with the direction signals for each axis.

    If a parallel port is adapted through a USB (using an adapter), the parallel port cannot have these signals happen in a simultaneous fashion and will cause the stepper motors of a CNC router or machine to be very clunky, if it works at all. To elaborate, the computer sends an instruction to the USB to send a high signal to pin 1, so it does, then another signal to pin 2, so it does. This is happening one after another. The speed at which this happens is reduced dramatically, and the position of one axis may now be out of sync to another axis.

    The reason the USB interfaces (linked above) work is that the USB delivers broad instructions to the interface (to a microcontroller) and the interface parses the instructions and outputs simultaneous signals to the stepper motor drivers.

    Hope this helps.

    Click the link to add information to this solution:
    My computer doesn't have a parallel port connection. Can I use a usb to parallel port cable to communicate with my breakout board?

  • As I am building my 20" x 24" laser engraver cutter, I notice that there is no parallel port on the onboard computer and I have the parallel breakout board any answers?

    Most motherboard do contain parallel ports, but the port connector may not be at the back (in the section where external connectors will be connected). Instead, the motherboard may contain an LPT ribbon connector on the actual face of the motherboard (usually along one of the edges). You will need a ribbon connector to a DB25 female connector.

    If your motherboard does not contain an LPT header on the motherboard, you can purchase a parallel printer adapter that plugs into one of the PCI slots. The price of the adapter is very inexpensive and sometimes is actually less costly than the actual ribbon connector.

    Click the link to add information to this solution:
    As I am building my 20" x 24" laser engraver cutter, I notice that there is no parallel port on the onboard computer and I have the parallel breakout board any answers?

  • Should I connect both the USB and the 25 pin connector of the parallel breakout board to the computer?

    The parallel breakout board has the db25 connector for data and the USB connector for power. Connect the USB from the computer to the parallel breakout board so the breakout board will have 5V of power coming from the computer. The db25 connector (connector with the 25 pins) receive data signals for each pin from 1 to 17 and have respective numbered screw terminals, some for input and some for output (18 to 25 are gnd pins).

    Click the link to add information to this solution:
    Should I connect both the USB and the 25 pin connector of the parallel breakout board to the computer?

  • I have a parallel. breakout board. and no parallel port at the back of my computer do those parallel. cards. work with the breakout board?

    If your computer does not have a parallel port, all you will need is a low cost PCI parallel adapter card (these can be found on amazon for $15-$20). If you plan on using a laptop (not recommended) you can try to find a PCMCIA parallel adapter, but many people have frequent issues with this setup. A more expensive solution would be to purchase a USB smooth stepper board. Unfortunately, we do not supply any of these adapters and cannot attest to their reliability.

    Additional Information:
    ur gay

    Additional Information:

    Click the link to add information to this solution:
    I have a parallel. breakout board. and no parallel port at the back of my computer do those parallel. cards. work with the breakout board?

  • MY COMPUTER DOES NOT HAVE A PARALLEL PORT. HOW DO I INTERFACE WITH THE MACHINE?

    If your computer does not have a parallel port, all you will need is a low cost PCI parallel adapter card (these can be found on amazon for $15-$20). If you plan on using a laptop (not recommended) you can try to find a PCMCIA parallel adapter, but many people have frequent issues with this setup. A more expensive solution would be to purchase a USB smooth stepper board. Unfortunately, we do not supply any of these adapters and cannot attest to their reliability.

    Additional Information:
    ur gay

    Additional Information:

    Click the link to add information to this solution:
    MY COMPUTER DOES NOT HAVE A PARALLEL PORT. HOW DO I INTERFACE WITH THE MACHINE?

  • MY COMPUTER DOES NOT HAVE A PARALLEL PORT. WHAT DO I NEED?

    If your computer does not have a parallel port, all you will need is a low cost PCI parallel adapter card (these can be found on amazon for $15-$20). If you plan on using a laptop (not recommended) you can try to find a PCMCIA parallel adapter, but many people have frequent issues with this setup. A more expensive solution would be to purchase a USB smooth stepper board. Unfortunately, we do not supply any of these adapters and cannot attest to their reliability.

    Additional Information:
    ur gay

    Additional Information:

    Click the link to add information to this solution:
    MY COMPUTER DOES NOT HAVE A PARALLEL PORT. WHAT DO I NEED?

  • If I buy a break out board where does it get it's power from, I don't see any 5 volt power supplies

    For the parallel Breakout Board, the USB will be its 5v power source, an Parallel will be its communication pathway. Now for the USB Breakout Board, the USB will be both its communicator and power source.

    Click the link to add information to this solution:
    If I buy a break out board where does it get it's power from, I don't see any 5 volt power supplies

  • Why wasn't I sent a parallel ready computer with my engraver laser kit?

    If you purchased a blackTooth that contains a motherboard and internal computer peripherals, and was also provided with a parallel breakout board, then you should have received a motherboard that provides parallel functionality. In fact, all of our motherboards have parallel port capabilities; however, the motherboards have the parallel port as a LPT header on the actual motherboard (not as a typical parallel port that would be located with the other external connectors. The header is labeled LPT and is generally located along the edge. The box that the motherboard is stored in shipping should contain a parallel port ribbon cable that connects to the LPT header on the motherboard.

    Click the link to add information to this solution:
    Why wasn't I sent a parallel ready computer with my engraver laser kit?

  • IF MY COMPUTER DOESN'T HAVE A PARALLEL PORT, HOW DO I RUN THE MACHINE?

    If your computer does not have a parallel port, all you will need is a low cost PCI parallel adapter card (these can be found on amazon for $15-$20). If you plan on using a laptop (not recommended) you can try to find a PCMCIA parallel adapter, but many people have frequent issues with this setup. A more expensive solution would be to purchase a USB smooth stepper board. Unfortunately, we do not supply any of these adapters and cannot attest to their reliability.

    Additional Information:
    ur gay

    Additional Information:

    Click the link to add information to this solution:
    IF MY COMPUTER DOESN'T HAVE A PARALLEL PORT, HOW DO I RUN THE MACHINE?

  • The instructions for installing the USB board say there should be a blue LED light up when computer is connected. I get a flashing red LED that goes solid when I start

    This is correct if it is the Mach3 USB controller. You will also get a rapid flashing led if you jog the machine (assuming the machine is not in reset mode or e-stop mode).

    Additional Information:
    Is it suppose to be blue or red? Mine is red.

    Click the link to add information to this solution:
    The instructions for installing the USB board say there should be a blue LED light up when computer is connected. I get a flashing red LED that goes solid when I start

  • can I purchase just the parallel controller board? I purchased the usb option 4 axis combo and would like to also try the system with my parallel port computer. Any help with this will be greatly appreciated; my goal is to implement mach4.
  • I DON'T HAVE A PARALLEL PORT ON MY COMPUTER. WHAT DO NEED?

    If your computer does not have a parallel port, all you will need is a low cost PCI parallel adapter card (these can be found on amazon for $15-$20). If you plan on using a laptop (not recommended) you can try to find a PCMCIA parallel adapter, but many people have frequent issues with this setup. A more expensive solution would be to purchase a USB smooth stepper board. Unfortunately, we do not supply any of these adapters and cannot attest to their reliability.

    Additional Information:
    ur gay

    Additional Information:

    Click the link to add information to this solution:
    I DON'T HAVE A PARALLEL PORT ON MY COMPUTER. WHAT DO NEED?

  • I'm connecting my PCI-e parallel expansion card to my 5 axis parallel port breakout board. However, the 3.3 volts coming out is not triggering servo step. I can measure hi/lo coming out of the parallel port when using Mach 3. Is the low voltage likely the issue or should I look elsewhere?

    In the mach 3 software there is a setting that can be check to allow either a high or low to trigger you motor. In Mach 3 Config/Ports&Pins/MotorOutputs/StepLowA will enable the motor with a low Voltage.

    Adjust the motor outputs to there corresponding step pin/direction pin(if setup is following our diagram):
    Step Dirt
    x 2 3
    y 4 5
    z 6 7

    Additional Information:

    Click the link to add information to this solution:
    I'm connecting my PCI-e parallel expansion card to my 5 axis parallel port breakout board. However, the 3.3 volts coming out is not triggering servo step. I can measure hi/lo coming out of the parallel port when using Mach 3. Is the low voltage likely the issue or should I look elsewhere?

  • I have a YDH-18-5 Power Supply AC Input:100-240v 47-63Hz, Ouput: 5v - 2A and need to know if its safe to use with the Parallel Breakout Board.

    The 5V power required for the breakout board can be a simple USB male to male cable, that will connect from your computer to the board itself.
    Now adding a external power supply make sure that it does not exceed a total of 5V and the standard 500 MilliAMP - 1 A.

    Click the link to add information to this solution:
    I have a YDH-18-5 Power Supply AC Input:100-240v 47-63Hz, Ouput: 5v - 2A and need to know if its safe to use with the Parallel Breakout Board.

  • Can I get a replacement computer only ? I have a blacktoe with parallel port and it seems to have stopped working.

    Sure. If you had your own computer to start with and now need a replacement for it, consider our redSprout and redLeaf systems. You can find information about them here: https://buildyourcnc.com/AssembledElectronics.aspx If you started with one of our assembled systems, and only need to replace certain components, contact our sales department at sales@buildyourcnc.com for a quote.

    Click the link to add information to this solution:
    Can I get a replacement computer only ? I have a blacktoe with parallel port and it seems to have stopped working.

  • Do you sell the computer system only ? My Dell has given up the ghost. I may want to buy the PC, Power and case. I have everything else.

    Currently the only options available for our computer systems, are for our machines which included all the motors and drivers. If you would like to talk about a custom order, please email (customerservice@buildyourcnc.com).

    Click the link to add information to this solution:
    Do you sell the computer system only ? My Dell has given up the ghost. I may want to buy the PC, Power and case. I have everything else.

  • Email link is not functioning. (continuation of z+ limit question) The Usb cnc controller is now switching what the limits are. IE: X- is showing up as Y+ ect. Is this a bad board? Thank you.

    All USB boards, are tested and checked before shipment for all axis, and inputs. Here is a link with clear instructions on how to setup Planet-CNC (http://www.planet-cnc.com/faq/machine_setup/).

    Please check continuity for each individual wire and for any crossover disruption when wiring your board, try to wire each as cleanly and with out crossing any live power wires and or motor motion wires.

    Click the link to add information to this solution:
    Email link is not functioning. (continuation of z+ limit question) The Usb cnc controller is now switching what the limits are. IE: X- is showing up as Y+ ect. Is this a bad board? Thank you.

  • Is there a mapping on the input (switch) pins to an axis on the parallel breakout board?

    The mapping of the input pins of the parallel breakout board is configured through software. The input pin are very versatile and can be mapped to all kinds of different types of input including axis limits and axis homing.

    Click the link to add information to this solution:
    Is there a mapping on the input (switch) pins to an axis on the parallel breakout board?

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