RS232 to TTL module

The RS232 to TTL Module converts RS232 serial signals to TTL levels for microcontroller interfacing. It bridges legacy RS232 equipment with modern 3.3V/5V microcontrollers for communication with computers, PLCs, and industrial serial devices.

Key Features

• RS232 to TTL level conversion
• Bi-directional communication
• 3.3V and 5V compatible TTL side
• Standard DB9 connector for RS232 equipment
• Baud rates up to 115200 bps
• Compact module with LED indicators
• MAX3232 or similar IC on board

Technical Specifications

Applications

• Legacy device interfacing
• Industrial equipment communication
• PLC programming and monitoring
• POS and barcode scanner connections
• GPS receiver interfacing
• Modem and serial device control

Important Notes

• Verify TTL voltage level matches your microcontroller (3.3V or 5V)
• MAX3232 supports both 3.3V and 5V; MAX232 is 5V only
• Null modem may be needed for direct PC-to-PC connection
• RTS/CTS hardware flow control pins may not be connected
• DB9 pinout: Pin 2=RX, Pin 3=TX, Pin 5=GND (standard)