板卡的优先级问题

bright

<>有个兄弟最近碰到问题说在做SCXI平台测热电偶的时候用了两张卡 </P>
<>Q:  一张1102  一张1122在实际应用中发现说两张卡采回来的数完全不一样,1102的数据是正确的,而1122测回来的数是不对的?</P>
<>A:在经过多次试验之后,发现用1102用通讯卡的时候1122采回来的数据才会出错,而用1122用通讯卡的时候两张卡采回来的数据确是正确的,正常情况下,用那张卡做通讯都没关系的,但是NI公司出的有些卡就存在一些问题,就像电脑里的板卡的中断优先级一样,在SCXI平台里也有优先级的问题,有些卡的优先级比较高,而1122就是一张这样的卡,所以在这个例子里就要用1122来做通讯卡.后来的NI的网站我发现有些朋友有发现同样的问题,所以我才发这个贴在这里,请大家在做类似的东东时考虑一下优先级的问题!</P>
<P>Problem: The first module in my SCXI system is an SCXI-1102 cabled to my Data Acquisition (DAQ) board, and the second module in the system is an SCXI-1122. The signals on the SCXI-1102 are fine, but my readings with the SCXI-1122 are off by about 7 to 10 Volts! What is the problem?</P>
<P>Solution: Some SCXI modules are higher priority modules, and thus must be cabled to the DAQ board. The SCXI-1122 is one of these modules. Change your configuration so that the SCXI-1122 is the controlling module (cabled to the DAQ board) instead of the SCXI-1102. After making this change, you should see that both modules are taking the correct readings.
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cpubbs

好，支持，有遇到过的困难，然后把解决方法贴出来给大家，这样很能帮到遇到同样问题的朋友，很宝贵的经验！大家以后有这样的方法也可以发布出来与大家共享！