Communication manner and device null highest priority in ru - punetsutowa -

摘要

PURPOSE:To prevent the decrease in the transmission efficiency of the instantaneous system communication by sending a signal shorter than the signal sent to acquire the transmission right when no significant signal to be sent in its own node station exists at the period while a trigger station sends the 2nd trigger signal. CONSTITUTION:When an address detection section 17 detects the address state of a transmission line 6 just after a packet signal sent from an upperstream node station passes and acquires the access right to the transmission line 6, the section 17 reads a data to be sent from a transmission data memory 12 and sends a packet signal S1. A control signal detection section 18 detects the 2nd trigger signal TG2, a head address storing a data in the transmission data memory 12 is stored in an address counter 117 when the level of an output 18-2 goes to logic 1 and the value of a register 115 is stored in a data length counter 118 because the value of the register 114 is logic 0 and after the access right to the transmission line 6 is acquired, the address detection section 17 sends a dummy packet signal D1. Thus, the communication of the instantaneous system is accommodated efficiently.