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Amazon.com: Suamdoen USB to TTL Serial 5V 3.3V Adapter Cable TX RX VCC GND Pinout with 4 Pin 0.1 inch Pitch Female Socket FTDI Chip for Windows 10 8 7 XP Vista
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PL2303TA USB RS232 to DB9 Cross Wired Rollover Null Modem Cable (Null Modem pinout: 2-TXD, 3-RXD 5-GND, 7-CTS. 8-RT) - Walmart.com
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Source FTDI Chip USB to 3P TX RX GND Interface Pinout Dupont Terminal 3.3V 5V TTL UART Serial Cable on m.alibaba.com
![Is the GND-pin of an USB-port connected directly to common ground? - Electrical Engineering Stack Exchange Is the GND-pin of an USB-port connected directly to common ground? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/skjGe.jpg)