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Serial Communication Drop in Performance with Long Cable or Breakout Box Connected I'm writing to several serial ports, when I run the same LabVIEW VI with a breakout box or a long cable connected to my serial board, the VI runs slower than when I have nothing connected. URL: http://digital.ni.com/public.nsf/allkb/8EC9C4F8C18D025E86256BF4007FD19C

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

How Do I Use My New Instrument Driver? I have downloaded an Instrument Driver from the Instrument Driver Network, NI Developer Zone, or some other source. How can I get started using my new Instrument Driver? URL: http://digital.ni.com/public.nsf/allkb/AE3B5C7A260C300C86256A3000770B50

我已經下載了儀器驅動程式，請問該如何使用呢？ 我已經從NI Developer Zone（儀器驅動程式網路或一些其它資源）下載了一個儀器驅動程式，但我不知道如何使用它。有什麼建議可以告訴我從哪裡開始使用各種儀器驅動程式嗎？ URL: http://digital.ni.com/public.nsf/allkb/EFA471E9D8FB9FAE8625725F00262549

What is the Maximum Number of Serial COM Ports I Can Have on My Computer? What is the maximum number of COM ports I can have on my computer using National Instruments Serial Products? URL: http://digital.ni.com/public.nsf/allkb/F7A9002D7B8E31E7862568D6006BD10B

Serial Communication General Concepts What is Serial? Back to Top Serial is a very common protocol (not to be confused with Universal Serial Bus or USB) for device communication that comes standard on just about every PC. Most computers include two RS-232 based serial ports. URL: http://digital.ni.com/public.nsf/allkb/2AD81B9060162E708625678C006DFC62

Serial Communication Starting Point Problem: Where can I learn about serial communication? Solution: This document will provide you with the basic knowledge and tools required to understand serial communication. URL: http://digital.ni.com/public.nsf/allkb/E22DA85E97818DE78625678C0069BFC9

Changing Motherboard Port Aliases to Serial Device Ports How can I assign the ports from my National Instruments serial card to be COM1 and COM2 instead of the built-in ports on the motherboard? URL: http://digital.ni.com/public.nsf/allkb/862567530005F09C86256675007E9068

How Do I Configure NI Serial Boards to Use COM1 Through COM4? How do I assign the serial ports of my National Instruments serial card to COM1, COM2, COM3, and/or COM4? URL: http://digital.ni.com/public.nsf/allkb/21B755BD2C48664786256CEF005645C2

What Bit Order Is Used to Transmit Data Bytes from the Serial Port ? Problem: What bit order is used to transmit data bytes from the serial port ? Solution: Data bits are transmitted with the least significant bit first. For example, the letter C = 0x43 (hex) = 01000011 (binary) will be transmitted as 1100001 (the last zero can be ignored). URL: http://digital.ni.com/public.nsf/allkb/040AC1BAEDCB381D862564EB005A410F