The EV331_TTL is a communication module RoHS-compliant manufactured by POWERBUS. It's a small form factor module featuring excellent communications capabilities. It features a TTL level serial port, allowing for high-speed communications protocols such as UART, SPI, I2C, Ethernet, and E1. The module also has a 3V DC power supply for an external power source, and an integrated Level Shifting circuit for better signal processing. Additionally, it supports various Operating Systems, making it highly compatible and easily integrated with a wide range of applications.