| 摘要 |
PURPOSE:To collect information of all slave stations in a short time by allowing plural slave stations to send information of own station to plural information parts of a simultaneous polling frame via each data transmission equipment CONSTITUTION:A transmission/reception interface circuit 1 constituting a data transfer equipment SK of a slave station receives a data from a data transmission equipment M1 of a master station, e.g., a simultaneous polling frame pfn, and sends the simultaneous polling frame pfn having, e.g., information of a slave station. A poll signal detection circuit 2 uses a control part C of the simultaneous polling frame pfn inputted trough the transmission/reception interface circuit 1 to detect the identify the simultaneous polling frame pfn and the detection is informed to an information transmission control circuit 3. In this case, the information of the data transmission equipment SK is sent to the K-th information part Ik corresponding to the station address K of the simultaneous polling frame pfn, and adds a check sequence part CS again and the result is sent to the master station via the circuit 1.
|
