| 摘要 |
<p>A communication apparatus for elevators comprises at least two elevator communication networks through which data is communicated with different protocols, and a network protocol converter connected between those networks. The network protocol converter includes a dual port memory for transferring ordinary data, a register memory for transferring priority data with read/write processing at shorter intervals, and a network controller provided in each of the communication networks for selectively choosing one of the dual port memory and the register memory to perform ordinary data transfer and priority data transfer. Since the least necessary data is transferred with priority via the register memory, protocol conversion and data transfer can be performed with minimum interference against the processing of the network controller and a delay in data transfer can be minimized. <IMAGE></p> |
