A compact RS232-to-TTL level shifter board that converts both TX and RX lines bidirectionally. Powered from your target application's supply voltage, it automatically converts RS232 signals to match — run it at 5 V for 5 V TTL, or at 2.8 V for 2.8 V CMOS TTL levels. Includes TX and RX indicator LEDs.

This version has no DB9 connector attached, making it suitable for field installations and projects where RS232 serial comes from non-DB9 sources.

Key Features

• Bidirectional RS232 ↔ TTL – Converts both TX and RX lines
• Voltage Flexible – Operates at any supply voltage, converting RS232 to matching TTL levels
• TX/RX Indicator LEDs – Visual confirmation of data flow
• Wide Baud Rate Support – 300 bps to 115,200 bps
• No DB9 Connector – Bare board for custom wiring

Specifications

• Conversion: RS232 ↔ TTL (TX and RX)
• Supply Voltage: Application-dependent (matches TTL output level)
• Baud Rate: 300–115,200 bps
• Dimensions: 1.2" × 1.1" (30.5 × 27.9 mm)

Ideal For

• Microcontroller-to-computer serial communication
• Field installations with RS232 devices
• Legacy serial equipment integration

Package Contents

• 1× RS232 Shifter SMD board (no DB9)

Resources

• Schematic (PDF)
• Eagle Files (ZIP)
• GitHub Repository