Communication system and communication devices having lock funct

Details Communication system and communication devices having lock funct Communication system and communication devices having lock funct

1991-06-11

1994-08-30

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 941, 3701101, H04L 1240, H04J 324

Patent

active

053434692

ABSTRACT:
A communication system includes at least one slave communication device to be a communication partner to a master communication device for performing data transfer therebetween using communication packets. Each of the communication packets includes control bits which are information relating to locking for the slave communication device and data length bits indicative of the size of a message to be transferred. In transmitting the communication packet from the master communication device to the slave communication device. The slave communication device is locked when locking is designated by the control bits and is unlocked when a message having a data length specified by the data length bits has been transferred successfully. Thus. The slave communication device can be locked or unlocked by the master communication device using the same control bits in accordance with information as to whether or not a predetermined message has been transferred successfully. Thus, the processing in the master communication device can made simple and the transfer efficiency of a message can be improved.

REFERENCES:
patent: 4707828 (1987-11-01), Yamuda
patent: 4788637 (1988-11-01), Tamaru
patent: 4914654 (1990-04-01), Matsuda et al.
patent: 4937816 (1990-06-01), van Steenbrugge et al.
patent: 4951281 (1990-08-01), Muto et al.
patent: 4998245 (1991-03-01), Tanaka et al.
patent: 5031175 (1991-07-01), Tanaka et al.

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