Ucom 208-2 Driver < SECURE ◆ >

Functionality: The UCom 208-2 driver enables data exchange between the operating system of a computer and the UCom 208-2 device. This is crucial for the device to function correctly, allowing it to send and receive data, and for the computer to recognize and control it.
Compatibility: The driver is typically designed to work with specific operating systems (Windows, macOS, Linux, etc.). It's essential to ensure that the version of the driver you are using is compatible with your operating system to avoid compatibility issues. ucom 208-2 driver

Symptoms of Missing or Corrupt Drivers

You know you have a driver problem if:

The device shows as "Unknown Device" with a yellow exclamation mark in Device Manager.
Your industrial software (e.g., Modbus scanner, DNC software) cannot open COM port 1-4.
You receive error code 10 (Device cannot start) or code 28 (Drivers not installed).
The device works on an old Windows XP machine but fails on Windows 10 or Windows 11.

Download USBDeview or Zadig.
Plug in the adapter.
Look at the Vendor ID / Product ID:
- VID_067B / PID_2303 → Prolific PL-2303
- VID_1A86 / PID_7523 → CH340/CH341
- VID_0403 / PID_6001 → FTDI FT232
Download the driver accordingly.

Official drivers are obsolete. UCOM no longer exists as an independent brand; no active support or downloads are available from modern sources.
The card likely used the HFC-S PCI chipset (Hofmann & Fechner, later Cologne Chip). If so, the generic HFC-S PCI driver (e.g., hfc-pci or hfcpci.sys) may work.
For Windows 2000/XP, drivers were last available on old driver CDs or archived sites (e.g., driver.de, archive.org).
For Linux, the driver is hisax (obsolete) or mISDN with HFC-PCI support.

No native support for Windows 7/8/10/11 (32 or 64-bit) – driver signing and architecture changes break compatibility.
May require a legacy 32-bit OS (Windows 98/ME/2000/XP) or a VM with PCI passthrough.
Often used with CAPI 2.0 (Common ISDN API) for fax, data, or PBX software.