| 摘要 |
<p>A server (1) sends an open command ordering the opening of a port when transmitting data to terminals (2-4). The open command has a plurality of bits for setting a flag for each port of the terminals (2-4). Of these bits, only the bit corresponding to the port that will be opened is set at, e.g., 1 and the other bits at, e.g., 0. Each of the terminals (2-4) receives the open command by its receiver (23, 33, 43) to check whether the bit in the open command corresponding to the receiving terminal is, for example, 1. When the corresponding bit is 1, the terminal opens its own port.</p> |
