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如何利用Serial埠寫入控制字元? 我需要輸入字串到一個透過序列埠(Serial port)連結的裝置，字串元包含'Ctrl B'這類的控制字元，但是在LabVIEW底下，當我輸入Ctrl B時並無法秀出任何字串。 URL: http://digital.ni.com/public.nsf/allkb/90560398647F1EA486256FE200230DB2

Setting the RTS Line for Different RS-485 Transceiver Modes What RS-485 transceiver modes support programmatically asserting and unasserting RTS (Request to Send)? URL: http://digital.ni.com/public.nsf/allkb/51BB669ECA0A919786256F1D007B6C32

在RS-485不同的收发器模式下设置RTS信号 RS-485的哪个收发器模式支持用程序设置或清除RTS(请求发送)信号？ URL: http://digital.ni.com/public.nsf/allkb/47DD1059046F603A8625741A0028C43C

How Can I Self-Test My PCI-485i-2 to Check That All Ports Work? I have a PCI-485i-2 and I would like to self-test it to make sure that all ports are working correctly. Can I perform a loopback test on this board. How can I go about testing this board? URL: http://digital.ni.com/public.nsf/allkb/8A99A85DAEED8FD686256DFE007DD605

Why Am I Not Able to Open COM Port in Windows After Using DOS Serial Commands I open a DOS window in Windows 2000 and copy a file to a National Instruments serial port (i.e. COM8) with the command: copy filename.txt com8 The printer attached to COM8 receives the data and I close the DOS window. Now when I URL: http://digital.ni.com/public.nsf/allkb/76431B0E2F30F08E86256DAB005584D0

How Do I Use Serial Communication in Visual Basic (Specifically v6.0)? I want to control a serial instrument using Visual Basic. How can I do this? URL: http://digital.ni.com/public.nsf/allkb/6E516A72B648340286256DA5005FA553

怎样在Visual Basic（尤其是 v6.0）中使用串口通信? 首先，强烈建议考虑用NI-VISA（在Measurement Studio中可用）来控制串口仪器。如果不选用这种方法，还是有可能在Visual Basic中与串口建立接口的（这里的内容是采用了Visual Basic6. URL: http://digital.ni.com/public.nsf/allkb/D350B8B399D6D82C862574AC0044073F

Options for Using the LabWindows/CVI ComCallback with Serial Interfaces I am using the ComCallback in LabWindows/CVI to access a serial port. There are three different Event Masks for the InstallComCallback function call: LWRS_RXCHAR, LWRS_RXFLAG, and LWRS_RECEIVE. These Event Masks are used to specify the events that URL: http://digital.ni.com/public.nsf/allkb/96D5CA4F03EDBC3686256D9100495C0F

How Do I Do a Loop Back Test with a 485 Port in Two Wire Mode? Problem: How do I do a loop back test with a 485 port in two wire mode? Solution: In RS-485 two wire mode you cannot do a traditional loop back test. A loop back test allows for simple testing of a port by sending and receiving data from the same serial port. URL: http://digital.ni.com/public.nsf/allkb/D5CC369B3E3E6F0586256D1600563245

How Can I Determine Which 'COM' Port Numbers Were Assigned to Each of the Physical Ports on My NI-Serial Card? I have one or more PCI or PXI Serial cards installed on a computer with Windows 2000. I can see all of the COM ports listed in MAX, but I can't tell which COM port corresponds to a particular physical port number on each of my cards. For example, I have a PXI-8420/8 and a PXI-8421/4, giving me a URL: http://digital.ni.com/public.nsf/allkb/2F3E79A91148077D86256D1100505200