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Article: RS-232C 422 485 line isolation solves more than fault problems.
- Article from:
- EDN
- Article date:
- September 28, 1995
- Author:
CopyrightCOPYRIGHT 1995 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Data-interface lines having different potentials relative to earth-ground connections can generate severe ground-current noise when connecting a computer with terminals in remote buildings or in different areas of one building. A few volts of potential difference can interrupt communications, and without current-limiting, this condition can damage equipment.
Noise on the interface cable can also disrupt sensitive analog circuits. Acting as an antenna, the cable couples high-frequency noise through the interface device, through the power supply, and into the analog circuits. Galvanic isolation eliminates this problem and other data-interface problems. Galvanic ...