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20pcs DC5V MAX3232 MAX232 RS232 To TTL Serial Communication Converter Module With Jumper Cable Geekcreit for Arduino - products that work with official Arduino boards
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www.doc-diy.net :: Compact RS232-TTL converter
PL2303TA USB TTL to RS232 Converter Serial Adapter Cable F Win XP/7/8/8.1 D | eBay
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MAX3232 RS232 Serial Port To TTL Converter Module DB9 Connector W/ 4 Jump Cables - Walmart.com
Pl2303 Ta Usb Ttl Rs232 Convert Serial Cable Pl2303ta Compatible - Integrated Circuits - AliExpress
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SparkFun RS232 Shifter - SMD - PRT-00449 - SparkFun Electronics
MAX3232 RS232 to TTL Serial Port Converter Module DB9 Connector MAX232 For Arduino DB9 Converter Module Board Equipment - Walmart.com
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BB-232LPTTL33-Serial Converter, RS-232 DB9 F / 3.3 V TTL DB9 M, Port Powered
