Store +3 USB to Serial Cable 3.3V signal level with breakout board SKU CGUSBSER3V $8.99 (USDollar) In stock Quantity: 1 Add to Bag Product Details USB to Serial Cable 3.3V signal level, 3.5mm plug. The 3.5mm plug fits a 3.5mm "audio jack". Uses FTDI drivers. This is TTL+3.3v level cable, not RS232 (+/- 12V) signal. Pinout: Tip - Tx, Ring - RX, Sleeve - Gnd. Support Android, Win 10/8/7, Linux, Mac OS. Save this product for later Favorite