HART(Highway Addressable Remote Transducer) multichannel switching circuit and method

Abstract

The application discloses a HART(Highway Addressable Remote Transducer) multichannel switching circuit, including a power voltage stabilizing circuit, a microprocessor, a HART signal modulation and demodulation circuit, N HART communication circuits and a multichannel switching control circuit, wherein N is an integer greater than 1. The power voltage stabilizing circuit is configured to provide the stable level for the microprocessor. The microprocessor is configured to send a polling acquisition command and other HART commands received by control chamber equipment and to return received HART equipment response information to the control chamber equipment. The HART signal modulation and demodulation circuit is configured to modulate data sent by the microprocessor and to demodulate data sent by the HART communication circuits. The HART communication circuits are configured to transmit data sent by the HART signal modulation and demodulation circuit to corresponding HART equipment and to return HART equipment response data to the HART signal modulation and demodulation circuit. The multichannel switching control circuit is configured to select one path of HART equipment for communication and to achieve point-to-point conversation with the control chamber equipment. The invention also provides a method adopting the abovementioned circuit.

Description

technical field [0001] The invention belongs to the technical field of HART communication, and in particular relates to a HART multi-channel switching circuit and method, which can enable multiple HART devices to share a common HART signal modulation and demodulation circuit. Background technique [0002] HART (Highway Addressable Remote Transducer), an open communication protocol for addressable remote sensor high-speed channels, is a communication protocol between on-site smart instruments and control room equipment launched by the American ROSEMOUNT company in 1985. After more than 10 years of development, HART technology has become very mature abroad and has become the industry standard for global smart meters. [0003] At present, HART equipment must communicate point-to-point when analog communication and data communication are carried out at the same time, and each HART equipment involved in communication must be equipped with a HART communication device, which is ver...

AI Technical Summary

Problems solved by technology

[0003] At present, HART devices must communicate point-to-point when analog communication and data communication are carried out at the same time. Each HART device participating in the communication must be equipped with a HART communication device, which is very costly and uneconomical.

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