A master that has identified a slave as capable of supporting PEC can use
Packet Error Checking for subsequent communications with this specific device
both when acting as a master-receiver as well as a master transmitter.
各位好，想请问这句中as的用法。
我想讨论的范围只有as capable of这里，想请问as在这边的是什么词性?只看后面的
capable of，很明显不是conj与prepconj连接词后面的开头要是一个主词；prep则是直接
接受词。所以as在这边是当副词吗?
可是上网查字典的用法，as当副词时的用法好像与这句也搭不上关系。
所以我在假设是不是在as跟capable of中间省略了主词跟be动词?
补充: The FCS is appended to the message as dictated by the protocol in the
earlier section
这里的as跟dictated也出现了类似的情况，请问要怎么样理解会比较好?