| 摘要 |
<p>PURPOSE:To transmit and receive commands of dangerous side and safety side by giving and stopping prescribed alternation of data mode to a specific time slot of time division multiplex transmission data in relation to the frequency where the time slot appears. CONSTITUTION:Plural data are transmitted and received at a region other than the specific time slot of a data frame in the normal time division multiplex system, and when a transmitting station 18 transmits a brake release command being a command of the dangerous side, the alternation of the data mode of ''1'' and ''0'' is given at each time slot in the specific time slot. When a receiving station 20 detects the alternation of the data mode, the brake release command is received. When the transmission station 18 transmits a brake command being a command of the safety side, the alternation of data ''1'' and ''0'' produced at each specific time slot is stopped. Then, the receiving station 20 receives the brake command.</p> |
