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arduino - Problems with homemade RS232-to-TTL converter board based on TI's MAX232 - Electrical Engineering Stack Exchange
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Multiprotocol Transceivers Combine RS485 and RS232 in a Single Device to Simplify and Shrink Applications that Use Both Standards | アナログ・デバイセズ
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MAX3232 RS232 to TTL Serial Port Converter Module DB9 Connector MAX232|Integrated Circuits| - AliExpress
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