All too often, that's something predetermined either by the server-side developers or, in most cases, by hooking into a pre-existing Web service that only supports a specific protocol.
很多情况下，这是由服务器端开发人员预先确定好的，也可能挂钩预先存在的web服务，而该服务只支持某种特定的协议。
Every device defines its own protocol, including whether or not it supports commands at all.
每个器件定义了它们自己的协议，包括它们是否支持命令。
This communication card supports the CAN2.0 protocol, and greatly improves performance of all sides, especially in error processing, overload ability and acceptance filter and so on.
该通讯卡实现了CAN 2.0通讯协议的所有功能，并且各方面的性能都有了很大的提高，尤其是在错误处理、超载能力以及接收滤波等方面。
This communication card supports the CAN2.0 protocol, and greatly improves performance of all sides, especially in error processing, overload ability and acceptance filter and so on.
该通讯卡实现了CAN 2.0通讯协议的所有功能，并且各方面的性能都有了很大的提高，尤其是在错误处理、超载能力以及接收滤波等方面。
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