MAX202 RS232 to TTL Converter For Arduino

This converter uses MAX202-based level shifter for converting TTL (Transistor-Transistor Logic) -level serial to standard RS232 serial.

RS232 is widely used in radio modifications,phone flash, XBOX360 flash, GPS, vehicle detection, DVD flash, hard disk repair set-top box upgrade. It can be used to program STC MCU, NXP MCU,Renesas MCU, STM32 MCU, N+-2EC MCU.

This converter can be connected to an Arduino Serial pin (0,1) to convert standard Arduino ttl to RS232. It allows arduino talk to hundreds of RS232 devices.

RS232 DB9 Pinout Diagram

RS-232 Maximum Cable Length

The maximum cable length for RS-232 is 50ft, but in practise depends on baud rate, cable specific capacitance and ambient noise. The table below contains some rules-of-thumb from experiments done by Texas Instruments years ago.

• 4 pin connector - GND, Logic out (STX), +5v, Logic In (SRX)
• Suitable for use with most microcontrollers
• 300 to 115200 bauds
• Pre-assembled board
• DB9 Female Connector (RS-232)
• Standard Header Connector (TTL)

• Schematic
• MAX202 datasheet
• RS232 interface pinout