A method and system for sending and receiving parallel two-bus communication

Abstract

This application discloses a method and system for sending and receiving parallel two-bus communication, which is applied to the controller side, including: performing voltage conversion on communication data to obtain a first voltage signal; Flat represents a binary signal; double-edge modulation is performed on the first voltage signal, so that the edge of high-low voltage conversion in the first voltage signal is slowed down to obtain a bus signal; the first signal is sent at a preset sampling rate Bus signal to monitor terminal. This application reduces the amplitude difference between the high and low levels of the first voltage signal, reduces the interference caused by signal jumps, increases the proportion of high levels in the entire signal, increases the power supply capacity, and further double-edges the first voltage signal The modulation slows down the edge of the high-low voltage transition in the first voltage signal, further reduces the interference effect caused by the voltage jump, enables the obtained bus signal to be transmitted over a long distance, and ensures that its own signal is not distorted.

Description

technical field [0001] The invention relates to the field of communications, in particular to a method and system for sending and receiving parallel two-bus communication. Background technique [0002] At present, most of the automatic fire alarm systems use two buses to realize the communication and power supply between the fire alarm controller and the on-site monitoring unit. The second fire bus is an asymmetric communication bus. The controller needs to take into account both communication and power supply when sending down codes. Therefore, the voltage modulation method is adopted; in order to minimize the voltage loss, the monitoring unit uplink code adopts the current loop method of the controller power supply. In order to ensure reliable communication and increase the transmission distance, the existing fire protection system often uses twisted pair as the transmission cable. [0003] However, in practical engineering applications, in order to take into account the ...

AI Technical Summary

Problems solved by technology

This kind of multi-core parallel wiring makes the interference between the lines bigger. On the one hand, it affects the code sending line. The existing two buses use square wave voltage signals with equal high-level and low-level pulse widths. As the transmission distance increases large, the interference becomes stronger, and the pulse width of the voltage signal arriving at the site control unit is too wide or too narrow. Since the monitoring unit uses a standard UART (Universal Asynchronous Receiver / Transmitter) interface for demodulation, it is easy to cause demodulation errors; on the one hand, It will affect the return code line. Since the return code of the monitoring unit adopts the current method, if the interference current in the line exceeds the identification current specified by the system, it will cause the controller to malfunction and cause a reception error.

The above two problems lead to a decrease in the communication success rate of the entire system and a shorter communication distance

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