RS232 to TTL serial interface module.

Model: RS232.
RS232 to TTL serial interface module.
Connect your projects to your computer through the RS232 (COM) serial port and perform data acquisition, process control, and debugging. This module solves the problem of the voltage difference between the RS232 serial port (+-12V) and the TTL microcontroller (5V), taking charge of converting the voltage levels bidirectionally and in a "transparent" way for the designer/programmer.
It is designed to operate in full duplex mode (sending and receiving simultaneously).

Specifications
Chip: MAX3232 Maxim
Operating voltage: 3V - 5.5V DC
Communication: serial
Transmission speed: 120Kbps (max)
Pins (TTL): TX, RX, VCC, GND.