Cannot Open Port Serial

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“What we’ve got here is failure to communicate.” In the 1967 movie classic “Cool Hand Luke,” these words were accompanied by a harsh whipping from the prison Captain.

The “Cannot Open Port” (COP) message can be just as excruciating when nearing a potentially lucrative deadline. Similar still, the two statements largely mean the same thing. There is a communication problem.

The COP error indicates that the software cannot speak to the device through the channel of communication that has been selected. This lack of communication could be caused by interference from outside software or even a mechanical failure in the port, cable or device. However, the COP error is most commonly caused by an incorrect port selection within Production Manager. The following steps will help resolve the issue. There is also a video below to help R-Series users who are experiencing port issues.

  • Failed to open serial port COM3 to communicate with board Uno. Make sure there is no other MATLAB arduino object for this board. For troubleshooting, see Arduino Hardware Troubleshooting.
  • Tried running program both in regular and elevated modes. Port appears in the Device Manager and communication on this port works with RealTerm. Port is created using a usb2serial dongle and named 'Prolific USB-to-Serial Comm Port (COM20)' in the Device Manager. Code is as follows.
  • Only one open connection can exist per SerialPort object. The best practice for any application is to wait for some amount of time after calling the Close method before attempting to call the Open method, as the port may not be closed instantly. SecurityPermission for calling unmanaged code.

Hi all, maybe not entirely sure if this is a labview question, but i was using labview when it happened. I am using labview to open and run a batch file using a COM connection and an FTDI RS232 to USB. Now i believe that portion of the code runs smoothly, ive tested it out and it worked at one point.

STEP 1: Identify the Port

The first question to ask is, “How/Where does my computer see the device?” This can be answered by looking in Device Manager or Devices and Printers depending on the device and the method in which it is connected.

Here is a table that shows you where to look in your computer for the various devices. The device is in the column on the left side of the table. Just scan down that column till you see your device. Then read accross to find out how to identify where your computers sees your device.

DeviceConnectionLocation
R-SeriesPreferred: USB-to-USB /
Alt.: Serial-to-Serial*
USB-to-USB = Make sure USB driver is installed. Check Device Manager for what COM # the USB Serial Port has been assigned.
Enduracut/Enduracut +/Enduracut 2Preferred: Serial-to-Serial*
Alt.: Serial-to-USB w/Keyspan / Parallel (Enduracut Plus only)
Serial-to-USB w/Keyspan (or similar USB-to-Serial Adapter) = Make sure the adapter is installed. Keyspan (or similar adapter) should show up by name in Device Manager’s “Port (COM & LPT)
Parallel = LPT #
Qe-Series/Q-SeriesPreferred: Serial-to-Serial*
or USB-to-USB /
Alt.: Ethernet-to-Ethernet (Qs only)
USB-to-USB = Make sure you have installed the USB driver. The cutter will show up in Windows’ “Device & Printers”. Go into the Printer Properties and find what USB00# port the cutter was assigned.
GraphtecPreferred: Serial-to-Serial*
or USB-to-USB
USB-to-USB = Make sure the Graphtec driver and controller have been installed.
Mutoh VJ(48/54/64/100)Alt.: Ethernet-to-Ethernet (FCs only) or Ethernet-to-EthernetMatch IP Addresses.
Click here for details.

*When connecting with a straight Serial-to-Serial cable, no matter what cutter you’re using, it should always be found on a COM port in Device Manager.

The easiest way to locate devices varies between operating systems. The most universal approach is to SEARCH your local computer for “Device Manager” or “Devices and Printers.”

Open

If you are searching in “Device Manager” (based on the above table), click on the “Ports” category to see where your equipment is listed. If the “Ports” category is not listed within Device Manager, you likely need to download equipment drivers.

If you are searching in “Devices and Printers” (based on the above table), right click the device in question. Click “Properties,” and then “Hardware.” This page should reveal the location of your device.

STEP 2: Match the Port

Cannot Open Port Serial Killer

Now that we know where your computer sees your device (either a cutter, printer or laser), we now need to make sure the software is trying to communicate through that same port.

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First, launch Production Manager from your desktop. When it opens, confirm that the brand and model listed in your setup are consistent with the equipment to which you are trying to send your job. Then, right-click on the setup, and choose the option to change the port. The connection type is probably at its default setting (COM1). If so, click this field to expand your options. You should now be able to click the COM or LPT port that matches that found in STEP 1. “Apply” and “Finish.”

Before sending a test job, make sure all other jobs are clear from Production Manager’s job queue as they may have bottlenecked during your COP error. Also, make sure that the correct equipment/setup is designated in your software’s cut/plot screen. Once this is done, cross your fingers, hold your breath and send the job. Hopefully, you found success! If not, don’t panic. There are other options to consider.

Cannot Open Serial Port Access Denied

Nevertheless, these directions will have resolved most “Cannot Open Port” errors. Your software and computer should now be communicating.

Cannot Open Port with R-Series Cutter?

This video demonstrates the above steps when working with an R-Series cutter. Arcgis 10.6 crack download.

Cisco usb driver windows 7. Open a console sessionUsing PuTTY or other terminal emulator, select 'Serial' as the connection type and change the 'Serial line' to match the COM port noted earlier.

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