Waveshare® USB To RS232/485/TTL Interface Converter, Industrial Grade Isolated USB Converter

Waveshare USB to RS232/485/TTL Interface Converter (Industrial Isolation, CH343G)

Product Overview

The USB to RS232/485/TTL Interface Converter is an industrial-grade, isolated USB adapter that converts USB signals to RS-232, RS-485, or TTL (UART). It’s designed for reliable communication in industrial environments and supports multiple operating systems.

Key Features

• Uses the original CH343G USB-to-serial chip for stable communication and wide compatibility.
• Industrial galvanic isolation between the USB side and serial interfaces enhances noise immunity and safety.
• Supports USB → RS-232, USB → RS-485, USB → TTL (UART) conversion (only one interface active at a time).
• Onboard power supply isolation — no external isolated power required.
• TVS surge protection and ESD protection for robust reliability.
• Self-recovery fuse and protection diodes improve shock and overload resistance.
• TTL voltage level selector (3.3 V / 5 V) via onboard configuration.
• Durable aluminium alloy enclosure with sand-blasted and anodized finish.
• Three status LEDs for power, TX, and RX indication.
• Supports Mac, Linux, Android, Windows 11/10/8.1/8/7 systems.

Interface Connectors & Protection

USB

• Connector: USB-B
• Operating voltage: 5 V USB supply
• Protection: 200 mA self-recovery fuse, isolated output

RS-232

• Connector: DB9 male
• Fully protected with TVS surge and ESD protection
• Point-to-point mode

RS-485

• Connector: Screw terminal (A+, B-, GND)
• Automatic hardware direction control
• Protection: 600 W surge suppression, 15 kV ESD (with optional 120 Ω termination)
• Point-to-multipoint (up to ~32 nodes)

TTL (UART)

• Connector: Screw terminal
• Logic-level selection: 3.3 V or 5 V
• Pins: TXD, RXD, GND, +5 V
• Clamp protection diode and over-voltage protection

Performance

• Supported baud rate (CH343G): up to ~600 000 bps for serial interfaces (not full range).
• RS-485 can operate up to ~2 Mbps.

Operating Conditions

• Temperature: −15 °C to 70 °C
• Humidity: 5 % RH to 95 % RH

Package Content

• USB to RS232/485/TTL Interface Converter × 1
• USB Cable × 1

Notes

• Only one serial mode (RS-232, RS-485, or TTL) can be active at a time.
• For RS-485 line termination, solder the optional 120 Ω resistor where needed.

Applications

• Industrial automation and control systems
• Serial device programming and debugging
• PLC and HMI communication interfaces
• Microcontroller and embedded system interaction
• Data logging and sensor interfacing