When there are not data being transmitted on the channel, both sides shall send link test packets every time interval C to maintain the connection.
当信道上没有数据传输时，通信双方应每隔时间C发送链路检测包以维持此连接。
2
This kind of communication mode employs three-wire connection and full duplex synchronous data transmission. It has the features of less link, fast speed, high reliability and etc.
这种通信方式采用三线连接，全双工同步数据传输，具有连线少、速度快、可靠性高等特点。
3
DataLink Properties wizard to help you create a connection to an OLE DB data source.