| 摘要 |
<p>In a half-duplex communication system in which additional delays in the communication channel (18, 20) may cause a message collision between a message and a response, a collision detector (40a, 40b) is utilized to prevent and detect message collisions. The collision detector determines (204) if a response may be transmitted from the communication device while it is receiving the current message. If no response is expected, the collision detector is placed (214) into a train mode. If a response is possible, the collision detector is placed (206) into the monitor mode. In the monitor mode, the collision detector monitors the communication channel and determines (210) if a message collision has occurred during transmission of the message. A detection of a message collision causes retransmission of the message or possibly a new message at a later time after it has been determined (202) that the communication channel is clear.</p> |
