IMPROVED ZONE CONTROLLER SERVICE METHOD
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2002-Apr-02
The current method of servicing asynchronous links (i.e. site links, MBX links, etc.) is a serial oriented process. The zone controller first checks to see which ports have data waiting, and then the data is read. Figure 1 demonstrates this. If 48 ports have data pending, port 1 will be processed, then port 2, and so on, until port 48 is the last one to have its data read.