What is the Difference Between Shield and Common on a RS485 Communications Port.
Issue
User maybe confused about when to use the shield or common on a RS485 port
Product link
PowerLogic and ION Power Meters
Environment
Serial Communications
Cause
Some RS485 communication ports have both a common and shield pin. Please see the picture below for reference
Resolution
The shield terminal is a landing terminal not internally connected. It is meant as a landing for connecting incoming and outgoing shield.
The Common terminal is electrically connected to the internal floating RS485 circuit that drives + & -.
A recommended example of a daisy chain connection to a meter without a "common “is shown below. To be sure please check the install guide for the specific meter you are installing. The "best" connection scheme depends on the internal circuits of the other device and the type of wire being used. Most devices without a labelled common use the terminal labeled "shield" also as a common (when it is connected internally to the circuit driving + and -).
게시 대상: 슈나이더 일렉트릭 Korea
도움이 필요하신가요?
제품 선택기
애플리케이션에 적합한 제품과 액세서리를 빠르고 쉽게 찾을 수 있습니다.
견적 받기
영업 관련하여 온라인으로 문의하시면 전문가가 연락드립니다.
구매처
해당 지역의 가장 가까운 슈나이더 일렉트릭 대리점을 쉽게 찾을 수 있습니다.
지원 센터
한 곳에서 모든 요구 사항에 대한 지원 리소스를 찾아보십시오.