Multi-slave data acquisition system for RS485 address multiplexing

Abstract

The invention discloses a multi-slave data acquisition system for RS485 address multiplexing. The system comprises a local controller and data acquisition slave devices. The RS485 bus below the localcontroller is connected with a plurality of different types of data acquisition slave devices; each type of data acquisition slave device comprises a plurality of data acquisition slave devices; dataof the same type uses the same RS485 slave address, the local controller carries serial number information of the slave devices in a data packet of lower-level slave devices, the number of slave addressing can be reduced, namely, a large number of slave management can be completed by using fewer slave addresses. Addresses are allocated to the slaves according to types, and functional characteristics of the slaves can be distinguished simply and visually. The plurality of slaves reuse the same address, so that more devices can be mounted under the same bus without worrying about insufficient slave device addresses.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a multi-slave data acquisition system with RS485 address multiplexing. Background technique [0002] In the traditional RS485 bus, one host device manages multiple slave devices, and each slave device is assigned an independent slave address. According to the traditional method, except the broadcast address, the slave address can only be set between 0x00~0xFE, that is, the maximum number of slave devices can only be configured to 254. In the case of not many slave devices, this architecture can satisfy the application, but it is not suitable for data acquisition systems with large-scale slaves (the number of slaves is greater than 255). [0003] Mainly there are following two weak points: [0004] (1) The same type of equipment is assigned different addresses, which is inconvenient to manage; [0005] (2) The number of slave devices is limited by the number of addresses ...

AI Technical Summary

Problems solved by technology

[0004] (1) The same type of equipment is assigned different addresses, which is inconvenient to manage;

[0005] (2) The number of slave devices is limited by the number of addresses and cannot be applied to large-scale slave systems

Images