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2x 100MW RS232 TTL RS232 RF Wireless Transceiver Module for Arduino UNO MEGA2560 [TB387*2] - USD $15.99 : canton-electronics.com
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4 Arduino Uno Microcontroller 2.4 RS 232 Max Series In microcontroller... | Download Scientific Diagram
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RS232 to TTL converter for weighing, but Serial Write Can't show perfect data - Project Guidance - Arduino Forum
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