RS232 to TTL Converter Module

From the shop's description

MAX3232 RS232 to TTL Converter Module This is a small handy module for rapid prototyping projects requiring RS232/PC interface to robotics and microcontroller based projects using 3.3V or 5V TTL logic. This module converts signals between RS232 voltage levels and TTL voltage levels. Features: High-Speed Communication: Supports data transfer speeds up to 115kbps or higher in short bursts for quick, reliable communication. SMD MAX3232 Device: Built-in MAX3232 device offers high-speed, efficient signal conversion between RS232 and TTL logic levels. Selectable Signal Levels: Allows selection of +3.3V or +5V TTL signal levels via a header for easy adaptation to different systems. Status LED (D1): Indicates the operational status of the module for convenient monitoring. Microcontroller Compatibility: Works with a wide range of microcontrollers like Microchip PIC, Atmel AVR, STM32, Renesas MCU, NXP MCU, and more. Versatile Applications: Used in various fields such as radio modification, XBOX360 flash, vehicle detection, phone flash, GPS, and hard disk repair. Easy Integration: Designed for simple use with PCs, laptops, and UART-compatible microcontrollers. Specifications: Attribute Value Working Voltage 3.3V to 5.5V PCB Size 32mm x 28mm Signal Conversion Device Built-in SMD MAX3232 Data Transfer Rate Up to 115kbps or higher in short bursts TTL Signal Levels Selectable +3.3V or +5V Port Interface TX, RX, VCC, GND Status LED Yes (D1) Microcontroller Compatibility Microchip PIC, Atmel AVR, STM32, etc. Applications Radio mods, XBOX360 flash, GPS, etc. TTL Connections Pinout for RS232-TTL Converter: Pin Function Description Pin 1 VCC (+) Requires 3.3V (or 5V for 5V TTL logic targets) to power the board. Pin 2 RX (MAX3232 ROUT1) TTL output, typically connected to the RX pin of a microcontroller’s UART. Pin 3 TX (MAX3232 DIN1) TTL input, usually connected to the TX pin of a microcontroller’s UART. Pin 4 GND Ground pin, connected to the 0V rail of the application hardware. Document: Data sheet ASCII_serial_port_crib_sheets