| 摘要 |
Communications protocol of the bidirectional synchronous type based on interruptions, applicable to digital systems for controlling the transmission of messages between a peripheral terminal unit and a set of subscriber terminal units. This protocol makes use of a single type of interruption, in which the types of message employed comprises a fixed length field (A) in which is indicated, at least, the subscriber terminal unit sending the message and its length and in which, during the complete reception of each message, only two interruption signals (I1, I2) are generated regardless of the number of bits that constitute the message (M). The first interruption signal (I1) is generated when the fixed length field (A) of the message is received, and the second interruption signal (I2) on reception of the rest (B) of the complete message, the length of which has been previously indicated in the fixed length field (A) of the message (M). |
