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Unable to use NI USB Serial Ports after Installing NI-Serial After upgrading or installing NI-Serial on a new system, I was unable to use the NI USB or ExpressCard serial ports attached to my computer. This hardware worked fine when a previous version of NI-Serial was installed on my system or when I use it with another computer. How can I get my ports URL: http://digital.ni.com/public.nsf/allkb/099F2D2720D86E8586257479004B8A37

USB 232/4 Device Shuts Down My USB 232/4 device works for a while and suddenly turns off and then back on after a couple of minutes. I have already checked the USB power settings in Device Manager to disable allowing to turn off device for power savings. I also verified that only one device is connected to one USB root URL: http://digital.ni.com/public.nsf/allkb/9D3890BE49FF5D43862573A7006E5612

How Do I Use the 'Is Port Connected' VISA Serial Property? I am trying to use the Is Port Connected VISA Property to detect if I have anything connected to my serial port, but I keep obtaining an error. What am I doing wrong? URL: http://digital.ni.com/public.nsf/allkb/8EFBA8A3A660A53686256FEB006C47AB

Changing the Wire Mode of a Serial Card on LabVIEW RT 7.1 on a PXI-814x Series Controller Fails with Error -1073807360 I have an application running in LabVIEW RT that changes the wire mode of my RS-485 serial card dynamically. After I upgraded to LabVIEW RT 7.1, it stopped working. I found KnowledgeBase 2EMAARXY (see link below) that explains that you need to set the wire mode using property nodes, instead URL: http://digital.ni.com/public.nsf/allkb/15D2D4942781D7E986256F43006E6F4A

Windows Cannot Load Drivers Required for this Device Error After Installing Software and Hardware for PCI-485/2 After installing the software and hardware for the PCI-485/2 on a Windows 2000 machine, I get the error Windows cannot load drivers required for this device. The COM ports appear in the Device Manager, but with exclamation points next to them. The diagnostic utility from the URL: http://digital.ni.com/public.nsf/allkb/52C2F2C7C7F04DB786256AD900675909

One or More Serial Ports Fail Interrupt Test in NI Serial Diagnostics; Windows Continues to Detect New Serial Hardware on Each Boot. NI serial boards, including the RS-232 and RS-485 boards, generally share the same base IO address and IRQ. Windows 3.1 and DOS require you to use serial boards with non-shared interrupts. NI serial boards designed for these operating systems require one interrupt for each port. If one URL: http://digital.ni.com/public.nsf/allkb/C6E3F85837846D4186256AC70070CAE1

Running Diagnostics on a Serial Board Generates a Control Register Error I have installed an AT-485/2 serial board. When I run the diagnostics, only one of the two ports is found. An error is generated that states that there is an overlap in the control registers. URL: http://digital.ni.com/public.nsf/allkb/BC93EFED699FCCE186256AAB0046907B

What Do the Error Numbers Received from the Serial Port VIs Mean? Problem: What do the error numbers received from the serial port VIs mean? Solution: The Serial Port VIs in LabVIEW for Windows return the errors reported by the Windows GetCommError function. URL: http://digital.ni.com/public.nsf/allkb/B1105AA4F3FEC4C98625697400648FAD