| 摘要 |
PURPOSE:To exclude transmitting stations that have no need to be used as the primary stations and to improve the overall efficiency of transmission for a data transmitting system, by using a primary station rejection answer command and a primary station forcible variation command. CONSTITUTION:Transmitting stations 11-1N are connected to a transmission line 10, and one of these transmitting stations is defined as a primary station with other stations used as the secondary stations for transmission of data. Thus the transmitting stations take charge of a primary station alternately to perform N:N transmission of data in a semidouble system. In this case, a command CND1 is used to reject a change into a primary station and the secondary stations having no need to transmit data deliver the command CND1. Thus the change into a primary station is inhibited for the transmitting stations which delivers the command CND1. In addition, a command CND2 is used to change forcibly a secondary station into a primary station. When a transmitting station 13 delivers a command CND2, a transmitting station 14 which is delivering a command CND1 is changed forcibly into a primary station. Then the station 13 executes another processing as a secondary station. |
