UNITEK Y-105 USB to RS232 Serial DB9 Adapter Cable 1.5M 1.2Mbps for Printer Label Writer ISDN
Bridge Modern USB to Legacy RS232 Serial – Effortlessly
The UNITEK Y-105 USB to Serial RS232 DB9 Adapter Cable provides a simple, reliable way to connect your computer (without a native serial port) to older devices that still rely on RS232 communication. Whether you're integrating industrial machinery, configuring network equipment, or using a serial printer or label maker, this adapter keeps your legacy hardware working with modern PCs.
Versatile Device Compatibility
This adapter connects your USB-A port to a DB9 male serial port. It works with a wide range of RS232 devices:
Serial printers and label writers (Zebra, Brother, etc.)
ISDN terminal adapters and modems
Industrial control systems, PLCs, and CNC machines
POS systems, barcode scanners, and cash drawers
Scientific instruments, medical devices, and test equipment
Legacy networking equipment (routers, switches with DB9 console)
Reliable Performance – Up to 1.2Mbps Baud Rate
Supports flexible baud rates up to 1.2Mbps (1,200,000 bits per second), sufficient for most serial communication tasks. It adheres to USB specification v1.1, ensuring broad compatibility with older devices that expect standard RS232 signaling.
Bus-Powered Simplicity
No external power adapter needed. The cable draws power directly from the USB port, making it truly plug-and-play for many applications. Simply connect the USB end to your computer and the DB9 end to your serial device.
Durable Construction
1.5-meter cable length – Enough reach for desk or workbench setups
Molded strain relief – Prevents cable damage at connector joints
Transparent dark brown finish – Distinctive, professional appearance
Setup & Driver Information
For many operating systems (Windows 10/11, macOS, Linux), the adapter may require a driver to function. UNITEK typically uses a reliable chipset (e.g., Prolific or similar). Please check the UNITEK support website for the latest driver downloads for your specific OS version. Once installed, the adapter appears as a standard COM port (Windows) or /dev/ttyUSB0 (Linux).
Note: Driver installation is required for full functionality on most systems. The cable is not guaranteed to work without the correct driver.
Ideal Applications
Industry Use Case
Office automation Connect legacy label printers
Industrial control Program PLCs via serial
Retail Connect POS receipt printers, barcode scanners
Telecom Configure ISDN adapters, modems
Hobby/DIY Interface with Arduino, microcontroller serial ports (baud rate compatible)
Keep your serial devices running with UNITEK Y-105 – the simple USB to RS232 solution for modern computers.
Technical Specifications
Frequently Asked Questions
1. What is this adapter used for? +
It allows a computer with a USB port (but no built-in DB9 serial port) to communicate with RS232 serial devices, such as older printers, label makers, industrial controllers, ISDN adapters, and modems.
2. What baud rates are supported? +
Up to 1.2Mbps (1,200,000 baud). It also supports common lower rates like 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200.
3. Do I need to install drivers? +
Yes, for most operating systems (Windows, macOS, Linux), you will need to install a driver. Check the UNITEK support website for the correct driver for your OS. The adapter uses a standard USB-to-serial chipset (e.g., Prolific or FTDI). Driver download is typically available.
4. Is the adapter bus-powered? Does it need external power? +
Yes, it is bus-powered – it draws power from the USB port. No external power supply is needed. However, some serial devices may require their own power source (the adapter only provides serial signaling).