令牌是沿着环发送的专门的消息。当某站有包发送时，等待令牌到达，得到令牌后先发送包，再发送令牌。
首次将一个ltpa令牌传递给服务器时。
When an LTPA token is passed to a server for the first time.
这打破了我的测试，因为我没有访问令牌传递给REST服务。
This breaks my tests because I do not have access tokens to pass to the REST services.
针对令牌传递与数据帧通信提出确有实效的时间参量软件控制方法。
In accordance with the token passing transmission and data frame communication, a effective software control method in time domain is proposed.
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