MAX232 RS232 TTL Converter

MAX232 RS232 TTL Converter Module DB9 Serial Port Connector these boards usually have a DB9 connector soldered at one end, and four header pins with jumper cables at the other end. The jumper cables enable the user to connect the wires to a breadboard or a microcontroller project board, whilst the DB9 connects directly to a COM port of a computer.

 which comes in a 16 pin narrow SO package. requires between 3.0 V to 5.5 V to operate and has two receivers and two transmitters. It has a maximum guaranteed data rate of 120 kbps, and the circuitry requires four 0.1µF charge-pump support capacitors. also compatible with the famous MAX3232 IC pins. These boards connect to systems with a UART  hence, they work with ATMEL and PIC microcontrollers.

MAX232 RS232 TTL Converter

URS232A is a TTL UART to RS232 Converter utilizing the MAX232 level shifter. It’s handy for interfacing microcontroller with RS232 device such as some GSM modem, RFID reader and etc. 

It can also be used together with the UC00A or UC00C USB to UART and becomes a USB to RS232 Converter. 

board comes pre-soldered with male DB9 connector, MAX232 and capacitors. 

Specifications Translator IC:

MAX3232 TTL Header Pitch :

2.54mm / 0.1in DB9 Connector Type:

Female Operating Voltage:3 V ~ 5.5 V Maximum Data rate:

512 kbps / 0.5Mbps (please see detailed test report) Temperature range:

-40°C ~ 85°C Operation: Full Duplex Protocol:

Transceiver :

2 (1 TTL -> RS232 + 1 TTL <- RS232) Receiver Hysteresis: 300mV

(DB9) is among the most popular interface between computer and devices such as GSM modem and RFID reader.

en.wikipedia.org However, since computer is using RS232 interface while microcontroller is using TTL UART interface, a level shifter is needed in order for the microcontroller to interface with the RS232 peripheral device.