不能是嵌套表达式的一部分。关于PAC系统内置函数，参考第八章”指令设定参考”。调用某些函数，如通讯请求(COMM_ REQ)，需要使用命令块或者参数块。对于这些函数，首先声明数组，在逻辑内进行初始化，然后作为一个参数传给函数。
IFR 2319E 500 MHz – 2.4 GHz RF Digitizer
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Temp/Humidity Chamber LH-1.5 Associate Research 120v, 6
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