UNITEK Y-1105K USB-C to RS232 Serial DB9 Adapter Cable 1.5M 1.2Mbps for Printer Label Writer ISDN
Connect Modern USB-C Laptops to Legacy RS232 Devices
The UNITEK Y-1105K USB-C to Serial RS232 DB9 Adapter Cable is the perfect solution for modern laptops, tablets, and other USB-C devices that lack traditional serial ports. If you have a MacBook, Dell XPS, Lenovo Yoga, or any USB-C computer and need to connect to older RS232 equipment – printers, label makers, industrial machinery, or ISDN adapters – this cable bridges the gap with reliable, high-quality performance.
Wide Device Compatibility
This adapter connects your USB-C port to a DB9 male serial port. It works with:
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
Reliable Performance – Up to 1.2Mbps Baud Rate
Supports flexible baud rates up to 1.2Mbps (1,200,000 bits per second), compliant with USB specification v1.1. This is sufficient for almost all serial communication tasks, from low-speed sensors to high-speed data logging.
Bus-Powered Convenience
No external power adapter needed. The cable draws power directly from the USB-C port, keeping your workspace tidy and your setup simple. Plug and go (after driver installation).
Durable Construction
1.5-meter cable length – Ample reach for desk, bench, or rack setups
Molded strain relief – Prevents cable damage at connector joints
Transparent dark brown finish – Distinctive, professional appearance
Robust DB9 connector – Gold-plated or corrosion-resistant contacts
Setup & Driver Information
For most operating systems (Windows, macOS, Linux), a driver is required. UNITEK uses a reliable chipset (e.g., Prolific or FTDI). Please visit the UNITEK support website to download the latest driver for your OS. Once installed, the adapter appears as a standard COM port (Windows) or /dev/ttyUSB0 (Linux).
Note: Driver installation is required. The cable will not function without the correct driver.
Ideal Applications
Industry Use Case
Office automation Connect legacy label printers to USB-C laptops
Industrial control Program PLCs, interface with serial equipment
Retail POS receipt printers, barcode scanners via USB-C
Telecom Configure ISDN adapters, modems
Field service Laptop‑based diagnostics of serial machinery
Why Choose USB-C Over USB-A?
Future-proof – modern laptops are moving to USB-C only
Reversible connector – no more fumbling with orientation
Same high performance as USB‑A versions
Keep your serial devices running with UNITEK Y-1105K – the modern USB-C to RS232 solution for today's laptops.
Technical Specifications
Frequently Asked Questions
1. What is this adapter used for? +
It allows a computer with a USB-C 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).
4. Is the adapter bus-powered? Does it need external power? +
Yes, it is bus-powered – it draws power from the USB-C port. No external power supply is needed. However, some serial devices may require their own power source (the adapter only provides serial signaling).