Most of the MCUs use TTL levels, and the computer serial port generally uses 232 levels. If we want the computer to communicate with the MCU, we need this Grove - 232. Communication between your Arduino and your computer will be exceptionally convenient with the integrated Grove interface. This module is based on Max3232, it supports multiple baud rate communication and theoretically supports communication up to 230400bps baud.

Easy to use
Stable, high speed
High cost performance
±15-kV ESD Protection
Low power consumption
Two Drivers and Two Receivers
Female DB9 Header
Typical Applications
Hand-Held Equipment
Palmtop Pcs