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Highway addressable remote transducer (HART) modem based on singlechip, and implementation method thereof

A technology of modem and single-chip microcomputer, which is applied in the direction of modulation carrier system, baseband system components, digital transmission system, etc., can solve the problems of high cost and single supply channel, and achieve the advantages of easy debugging, strong computing ability and high cost Effect

Inactive Publication Date: 2015-04-22
北京维盛新仪科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The HART modem is implemented based on a single-chip microcomputer, which can solve the problems of high cost and single supply channel in the prior art

Method used

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  • Highway addressable remote transducer (HART) modem based on singlechip, and implementation method thereof
  • Highway addressable remote transducer (HART) modem based on singlechip, and implementation method thereof
  • Highway addressable remote transducer (HART) modem based on singlechip, and implementation method thereof

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] In one embodiment of the present invention, a modem supporting the HART protocol is realized by using STM8L15x series single-chip microcomputers. The STM8L15x series microcontroller is an 8-bit microcontroller (MCU) launched by STMicroelectronics. It has a built-in 12-bit DAC (digital-to-analog converter), a DMA (direct memory access device) with a cyclic mode, and a DMA time reference The timer (TIMER) can constitute a modulation module. Of course, the present invention can also be implemented by using other general-purpose single-chip microcomputers with similar functions, such as STM8L10x series or STM8L16x series, and no examples are given here.

[0046] figure 1 The overall system block diagram of the HART modem provided by the present invention. The HART modem includes RTS (request to send) / automatic half-duplex contro...

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Abstract

The invention discloses a highway addressable remote transducer (HART) modem and an implementation method of the HART modem. According to the HART modem, a data receiving module, a parallel to series conversion module and a modulation module are sequentially connected with one another and are connected with a buffering or filtration or blocking module through a first gating switch together with a half duplex control module; a data sending module, a series to parallel conversion module and a demodulation module are sequentially connected with one another; a period module and a threshold module are connected with the demodulation module through a second gating switch; a filtration or biasing module is respectively connected with the period module and the threshold module; and an isolation module is respectively connected with the buffering or filtration or blocking module and the filtration or biasing module and then connected with an input / output module. The HART modem can be implemented based on a singlechip, so that the problems of relatively high cost, single commodity supply way and the like in the prior art are solved.

Description

technical field [0001] The invention relates to a modem based on a single-chip microcomputer and capable of supporting the HART (Highway Addressable Remote Transducer, addressable remote sensor high-speed channel) protocol, and also relates to a method for realizing demodulation of the HART modem, which belongs to the technical field of industrial automation. Background technique [0002] With the rapid development of industrial automation, PLC (Programmable Logic Controller, Programmable Logic Controller), DCS (Distributed Control System, Distributed Control System) and other automatic control devices have been widely used in industrial sites. This puts forward higher and higher requirements for the communication guarantee capability of the industrial site. On the one hand, the peripheral equipment represented by the transmitter in the industrial field needs to communicate with the control equipment anytime and anywhere; on the other hand, the addressing method needs to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L25/02
Inventor 张平谢翔朱爱松
Owner 北京维盛新仪科技有限公司