RainbowLink V2: 4-Channel Isolated USB to Serial Converter (RS485/RS232/Dual TTL) with Built-in 12V Power Supply

Pocket-Sized Debugging Workstation. Eliminates the need for multiple dongles and bulky power adapters. RainbowLink V2 combines 4 independent communication channels (Isolated RS485 & RS232 + 2x TTL) and a versatile power supply (12V/5V/3.3V) into one rugged device. Ideal for field engineering, IoT development, and industrial automation.

Facilitates testing of 12V industrial sensors in the field. Unlike standard converters that only transmit data, RainbowLink V2 features a built-in boost converter. The device converts USB 5V input into 12V (800mA), 5V (2A), and 3.3V (200mA) outputs.

• Application: Powers and debugs water level sensors, soil meters, or PLCs directly from a laptop USB port without requiring an external bench power supply or wall outlet.

Four Channels, Simultaneous Operation

Replaces four separate USB dongles with one robust device. All channels operate independently:

• Channel 1: RS485 (Fully Isolated) – For industrial PLCs and long-distance sensors.
• Channel 2: RS232 (Fully Isolated) – For legacy hardware and standard serial devices.
• Channel 3 & 4: TTL (UART) – For microcontrollers, GPS modules, and sensors.

Industrial-Grade Protection (V2 Upgrade)

Prevents damage to connected computing equipment. The V2 edition features Full Signal & Power Isolation for the RS485 and RS232 interfaces. This critical feature blocks high-voltage surges, ground loops, and electrical noise, ensuring computers and prototypes remain safe during harsh industrial debugging.

Enhanced Usability and Design

• Smart Port Naming: The dedicated driver clearly names the ports in Device Manager (e.g., "RainbowLink RS485"), enabling precise identification of the correct COM port without guesswork.
• Tool-Free Wiring: Equipped with high-quality lever-type spring terminals. Allows for quick connections by simply flipping the lever, inserting the wire (12-22AWG), and snapping it shut.

Appllications

• Outdoor Sensor Testing: Debugging 12V RS485 soil sensors using only a laptop.
• Industrial Maintenance: Safely connecting to high-voltage PLCs via isolated RS232.
• R&D Prototyping: Monitoring data from an ESP32 (TTL) and a GPS module (TTL) simultaneously.

Specifications

• Model: RainbowLink V2 (TEL0190)
• Input Interface: USB Type-C (5V)
• Total Channels: 4 Independent Channels
• Communication Protocols: 1x RS485 (Isolated), 1x RS232 (Isolated), 2x TTL
• Power Output: 12V @ 800mA
• Isolation Voltage: Signal & Power Isolation (for RS485 & RS232)
• Baud Rate Support: 2400bps - 128000bps
• Operating Systems: Windows, Linux (including Raspberry Pi), MacOS
• Dimensions: 77mm × 57mm × 21mm (Fully Enclosed PC Housing)

WIKI: https://wiki.dfrobot.com/tel0190/