Features 1、[Scope of Application] MCUs such as single chip microcomputer and ARM communicate with the computer through the computer's serial port (COM port). 2、[Serial Port Expansion] TTL to RS232 module can be used to expand the serial port of the device, which is the best choice for your device. 3、[Applicable Scenarios] Suitable for radio modification, mobile phone flashing, for XBOX360 flashing, GPS, car testing, DVD flashing, hard disk repair, and set top box upgrades. 4、[Plastic Material] RS232 serial port module is made of finely crafted plastic material, wear resistant and durable, and can be used for a long time. 5、[Lightweight and Portable] TTL to RS232 module is light in weight, small in size, easy to carry and store, no matter where you go, it is convenient to carry and use. Specification Item Type: TTL to RS232 Module Material: Plastic Both TTL and RS232 terminals must be connected to TXD and RXD, RXD to TXD, intersect matching connection TTL (UART) End: VCC: Connect to DC 3V-5.5V GND: Connect to GND TXD: Connect to the TTL End RXD of the External Device RXD: Connect to the TTL Terminal TXD of the External Device RS232 Terminal: RXD: Connect to the External Device RS232 Terminal TXD TXD: Connect to the RS232 Terminal RXD of the External Device GND: Connect to GND Package List 1 x TTL to RS232 Module