怎样在串或并口上加上持续的高，低电平？

[lianok]

大家好，我在做的一个实验仪器要求用labview控制一个芯片的逻辑电平，而且这个电平可以持续较长时间，譬如维持高/低电平几分钟。我打算用labview给串或并口的某针脚上加电平控制逻辑电路，但不知道具体怎样做，譬如用并口的具体哪个针脚，用labview的哪个函数来控制并口的针脚？或者还是有其它办法用labview产生逻辑电平呢？？我是个新手，恳请大家多给些意见！谢谢！

[Ray.R]

English translation:

Hello everyone,

I have to do an experimental apparatus that requires LabVIEW to control a chip's logic level, and this level can be sustained for a long period of time, such as maintaining a high level / low level a few minutes.  I intend to use LabVIEW with a parallel port pin on the power-level control logic circuit, but I do not know how to do it.  For example, which specific pin parallel port to use, which function to use LabVIEW to control the parallel port pin? 

Are there any other ways to use LabVIEW to generate logic levels?  I am a novice, I urge everyone to give some advice! Thanks!

[Ray.R]

Have a look at the following link.  Have a look at the document called "General_Information_on_parallel_ports.pdf".

http://forums.ni.com/ni/board/message?board.id=170&message.id=96480

看看下面的链接。看看这份文件名为“ General_Information_on_parallel_ports.pdf ” 。

[Ray.R]

Have tried the parallel port example?

Open LV, Under "Help", select "Find Examples", and do a search under parallel (search tab & enter "parallel" ).

You will find 2 examples:

1. Parallel Port Additional Data Register
2. Parallel Port Read & Write Loop.

Run either one. You should be able to set and read the port. There is a description in the example how to do this. Look at the "LEDs".

If you look at the first example, under the "IO connector Status" tab, you will find the D-sub pinout. If you run it, it will give you the present status of your pins.

They recommend using the Standard mode (SPP) setting in your PC's BIOS.

試圖並行端口例子嗎？

開放呂， “幫助”下，選擇“查找例子” ，並進行搜索根據平行（搜索標籤＆進入“平行” ） 。

你會發現2例子
1 。並口附加數據寄存器
2 。並口讀與寫循環。

運行1 。您應該能夠成立，並宣讀了港口。有一個例子說明如何做到這一點。查看“發光二極管” 。

如果你看一下第一個例子，在“輸入輸出連接狀態”選項卡，你會發現在D - Sub和引腳。如果您運行，它會給你的現狀您引腳。

他們建議使用標準的模式（許可證）設置在你的電腦的BIOS 。

Message Edited by JoeLabView on 02-11-2009 07:44 AM