ITEM NAME:CP2102 T1 3.3v to ttl uart module serial converter download usb drive wire Z a.imagelink a:hover.imagelink {color:#db3606;.The head of machine serial port DB9 PC, level ±12V and negative logic, if you want to receive single-chip MCU need serial Serial converter as MAX232 circuit are compatible with level MCU signal. Therefore, transfer USB serial port can be received on the serial port MCU directly without using the circuit MAX232, more practical use.