PURPOSE: To correctly transmit and receive a command or data by adding the frame bit of one bit and a CRC bit to decide whether reception is correct or not to the head and the end of a frame at the time of transmitting the frame, and making the transmitting period of the frame into more than twice the frame length.
CONSTITUTION: The command of a request to send information to be transmitted from a master part 1 to a slave part 2 has the frame bit of one bit of logical '1' at its head, command data bits at its middle, and the CRC additional bit for deciding a transmission error at its end. First of all, when the master part 1 sends a command frame, all the slave parts 2 connected to a command bus 3 receive the command frame, and only when the command addressed to its own slave part is received normally, the slave part responds by transmitting information to the master part 1 through an answer bus 4. Then, this command frame is sent at the period more than twice as long as the frame length. Thus, even if a unit to be monitored is increased or taken away during the operation of a system, the command or the data can be correctly transmitted and received.
| JPH1166481 | APARTMENT HOUSE SECURITY SYSTEM |
| JPH08235096 | SETTING SYSTEM AND METHOD FOR INTER-PROCESS LINK CONNECTION |
| JPS59138154 | INFORMATION TRANSMISSION SYSTEM |
MORIMOTO AKIO
NAKADE HIROSHI
SAITO FUMIHIKO
MIURA NORIHISA
| JPS58198967A | 1983-11-19 | |||
| JPS62206948A | 1987-09-11 | |||
| JPS6449454A | 1989-02-23 |