Method and system for increasing number of RS485 bus hitching devices

A technology of RS485 and equipment, which is applied in the direction of digital transmission system, transmission system, bus network, etc., can solve the problem that the delay time cannot be synchronized, and achieve the effect of avoiding too long sleep, ensuring effective work, and increasing the number of equipment

Inactive Publication Date: 2021-04-30
全测(厦门)科技有限责任公司
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the differences in the components of each device, the delay time cannot be consistent. After using the above method, there may still be more than 2 devices working at a certain time after the system has been running for a long time.
Therefore, too many devices cannot be connected to the current RS485 bus

Method used

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  • Method and system for increasing number of RS485 bus hitching devices
  • Method and system for increasing number of RS485 bus hitching devices
  • Method and system for increasing number of RS485 bus hitching devices

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Embodiment Construction

[0027] The invention discloses a method for increasing the number of devices connected to the RS485 bus. By adding a SYNC synchronization signal line on the RS485 bus, the device is also connected to the SYNC synchronization signal line when the device is connected to the RS485 bus; The synchronization signal line judges whether there is a device on the current RS485 bus that is in a normal working state. If not, the device enters a working state, otherwise it enters a sleep state again.

[0028] The invention adopts the SYNC synchronous signal line combined with the dormancy mechanism, so that only one device handles the working state of the RS485 bus at the same time, thereby reducing the peak power consumption of the system and greatly increasing the number of devices that can be connected to the RS485 bus. Compared with the current method of broadcasting to detect the working status of devices on the RS485 bus, the present invention can directly obtain the working status of...

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Abstract

The invention relates to a method and system for increasing the number of RS485 bus hitched devices, and the method comprises the steps: adding an SYNC synchronization signal line on an RS485 bus, and enabling the devices to be connected with the SYNC synchronization signal line when the devices are hitched on the RS485 bus; and enabling the devices to judge whether devices on the current RS485 bus are in a normal working state or not through an SYNC synchronous signal line, if not, enabling the devices to enter the working state, and otherwise, enabling the devices to enter dormancy again. According to the invention, an SYNC synchronous signal line is combined with a dormancy mechanism, so that the RS485 bus only has one device processing working state at the same moment, the peak power consumption of the system is reduced, and the number of devices capable of being hung on the RS485 bus is greatly increased.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a method and system for increasing the number of devices connected to an RS485 bus. Background technique [0002] RS485 bus is a low-cost and easy-to-use bus, which adopts half-duplex working mode, supports multi-point data communication, and is widely used in various measurement and control fields. The RS485 bus can theoretically mount up to 400 devices, but it is usually limited by factors such as the driving capability of the RS485 level conversion chip, the impedance matching of the bus, and the power supply capacity of the system. The actual number of devices that can be connected to the bus is often much smaller to the theoretical value. Especially when the power consumption of the device is high and the power supply is centralized, multiple devices work at the same time, the current of the bus is high, and the line loss is large, causing the power supply voltage of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L12/403
CPCH04L12/40006H04L12/403
Inventor 林忠侣姚鸿义张九龙邱少惠王伟
Owner 全测(厦门)科技有限责任公司
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