The traditional RS485 interface circuit

Published:2011/7/1 22:57:00 Author:Fiona | Keyword: traditional RS485 interface | From:SeekIC

Used as a common communications interface devices, RS-485 / RS-422 chip can find corresponding models in many semiconductor companies, such as the ADI company ( device prefix is ADM).Most of the industrial RS-485 bus's customers should use the following circuit which connection is shown as the figure, this 485 circuit is mainly composed of 2 or 3 quick optocouplers,RS-485 transceiver device and isolating power supply module.Its advantages are simple connection and cheap price,its shortcomings are that using more device,big occupancy of the PCB area and thephotoelectric coupler is limited at the speed limit, power and LED aging.



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