An RS232 card is used to establish RS232 communication with devices powered by 3V - 5.5V. It includes an SP3232 (RS-232 Transceiver) and a DB9 connector for connecting a PC and MCU. The RS232 card features ESD protection and supports hardware flow control.
You can order an RS232 Card from SAMM Market's Modules category at a reasonable price, with same-day shipping and fast delivery.