Cables
USB RS232 2.5MM Audio Jack Chip Serial Converter Programming Cable
Connector : USB to 2.5mm audio jack
Pinout : TX RX GND
Serial : RS232 (not TTL)
Pin Assignment 01 : TX-Tip,RX-Ring,GND-Sleeve
Pin Assignment 02 : RX-Tip, TX-Ring,GND-Sleeve
Feature : USB Serial Programming Cable