| 摘要 |
<p>A high rate of exchange of information between a station monitor (10) and each one of multiple associated stations (20, 30, 40) in a key telephone system (100) is economically achieved by using a multipurpose computer (300) in each associated station (20, 30, 40) to provide the universal asynchronous receiving transmitting (UART) function. Serial transmission of asynchronous data is full duplex for the station monitor (10) and half duplex for each associated station (20, 30, 40), with the station monitor (10) polling a first station (20) and then obtaining that station's response. While the first station (20) is responding, the station monitor (10) polls a second station (30) and continues in this manner until all the associated stations (40) are polled. The UART function also allows the computer (330) to process other tasks during the same period of time that the serial transmission or reception of data is occurring.</p> |
