CN204101631U - 电能表485通讯改进电路 - Google Patents

电能表485通讯改进电路 Download PDF

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Publication number
CN204101631U
CN204101631U CN201420523229.9U CN201420523229U CN204101631U CN 204101631 U CN204101631 U CN 204101631U CN 201420523229 U CN201420523229 U CN 201420523229U CN 204101631 U CN204101631 U CN 204101631U
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communication
polarity
resistor
pull
adaptation
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CN201420523229.9U
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English (en)
Inventor
谷江涛
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Anhui Nari Zenith Electricity & Electronic Co Ltd
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Anhui Nari Zenith Electricity & Electronic Co Ltd
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Abstract

电能表485通讯改进电路，其涉及电子学技术领域。其特征在于它包含自适应485芯片、保护器件TVS、保护器件热敏电阻Rt、上拉电阻R43和下拉电阻R42，自适应485芯片电源端接VCC，地端接GND，通讯接口A、B之间接保护器件TVS，B端后接保护器件热敏电阻Rt，之后为通讯口信号B/A，另一端为信号A/B，A、B为通讯极性，在通讯A端接一个20K的上拉电阻，使其不通讯时保持为A极性，在B端添加一个20K的下拉电阻，使其在不通讯时保持B极性。本实用新型具有结构简单、布局合理、能明确通讯极性、保证通讯成功等特点。

Description

电能表485通讯改进电路
技术领域
本实用新型涉及电子学技术领域，具体涉及电能表485通讯改进电路。 
背景技术
现有的电能表485通讯电路为：自适应485芯片电源端接VCC，地端接GND，通讯接口A、B之间接保护器件TVS，B端后接保护器件热敏电阻Rt，之后为通讯口信号B/A，另一端为信号A/B，A、B为通讯极性，该通讯线路在通讯时自动检测调整极性，产生适合的A/B极性。 
缺点:自适应485通讯电路是通过检测发送方的信号极性来进行相应调整，若对方也是自适应极性通讯设备，则难以进行极性判断，就会出现信号通讯不稳定，数据丢失等现象。 
发明内容
本实用新型的目的是提供电能表485通讯改进电路，其具有结构简单、布局合理、能明确通讯极性、保证通讯成功等特点。 
为了解决背景所存在的问题，本实用新型是采用以下技术方案的：它包含自适应485芯片、保护器件TVS、保护器件热敏电阻Rt、上拉电阻R43和下拉电阻R42，自适应485芯片电源端接VCC，地端接GND，通讯接口A、B之间接保护器件TVS，B端后接保护器件热敏电阻Rt，之后为通讯口信号B/A，另一端为信号A/B，A、B为通讯极性，在通讯A端接一个20K的上拉电阻，使其不通讯时保持为A极性，在B端添加一个20K的下拉电阻，使其在不通讯时保持B极性。 
    本实用新型的优点：上下拉电阻保证了在与同样是自适应485设备通讯时，明确通讯极性，保证通讯成功，而与固定极性设备通讯时，由于20K电阻产生的上下拉强度不高，不会影响到正常通信。 
附图说明
图1为现有的电能表485通讯电路结构图；
图2为本实用新型的结构图。
具体实施方式
    参照图2，它包含自适应485芯片、保护器件TVS、保护器件热敏电阻Rt、上拉电阻R43和下拉电阻R42，自适应485芯片电源端接VCC，地端接GND，通讯接口A、B之间接保护器件TVS，B端后接保护器件热敏电阻Rt，之后为通讯口信号B/A，另一端为信号A/B，A、B为通讯极性，在通讯A端接一个20K的上拉电阻，使其不通讯时保持为A极性，在B端添加一个20K的下拉电阻，使其在不通讯时保持B极性。 

Claims (1)

1.电能表485通讯改进电路，其特征在于它包含自适应485芯片、保护器件TVS、保护器件热敏电阻Rt、上拉电阻R43和下拉电阻R42，自适应485芯片电源端接VCC，地端接GND，通讯接口A、B之间接保护器件TVS，B端后接保护器件热敏电阻Rt，之后为通讯口信号B/A，另一端为信号A/B，A、B为通讯极性，在通讯A端接一个20K的上拉电阻，使其不通讯时保持为A极性，在B端添加一个20K的下拉电阻，使其在不通讯时保持B极性。
CN201420523229.9U 2014-09-12 2014-09-12 电能表485通讯改进电路 Expired - Fee Related CN204101631U (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420523229.9U CN204101631U (zh) 2014-09-12 2014-09-12 电能表485通讯改进电路

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CN201420523229.9U CN204101631U (zh) 2014-09-12 2014-09-12 电能表485通讯改进电路

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CN204101631U true CN204101631U (zh) 2015-01-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104579419A (zh) * 2015-01-28 2015-04-29 国家电网公司 应用于rs-485通信系统中的信号增强设备
CN105429122A (zh) * 2015-11-16 2016-03-23 国网山东省电力公司济宁供电公司 一种无极性rs485防护适配器电路

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104579419A (zh) * 2015-01-28 2015-04-29 国家电网公司 应用于rs-485通信系统中的信号增强设备
CN104579419B (zh) * 2015-01-28 2017-05-24 国家电网公司 信号增强设备以及rs‑485通信系统
CN105429122A (zh) * 2015-11-16 2016-03-23 国网山东省电力公司济宁供电公司 一种无极性rs485防护适配器电路

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