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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
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RS-485(在AT-485板卡上可看到)和RS-422(在422CV和一般Mac上可看到)是电气兼容的接口。两者的引脚分布完全相同。
但是,RS-485接口具有输入保护功能以保证接口控制器芯片不受高电流值的损害。而RS-422接口没有上述设置,因此在将两者共同使用时尤其需要注意。
422标准在多站模式下支持10台仪器。485标准在多站系统中支持多达32仪器。然而,一个多站系统中的所有设备必须使用同一协议。很多情况下,仪器制造商或是不会以一种多站协议为设备编程,或是不会发布其协议并要求使用其专有软件。
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