Ucom 704 Driver Download Free

Before diving into the download, it’s crucial to understand what you’re working with. The UCOM 704 is most commonly identified as a USB 2.0 to Serial (RS-232) Adapter Cable. UCOM (Universal Communication) was a popular brand in the early-to-mid 2000s, producing connectivity hardware for networking and legacy industrial equipment.

Common Uses of the UCOM 704:

The internal chipset is typically a Prolific PL-2303 or, in rarer cases, an FTDI chip. This matters because the driver you need depends entirely on that chipset.

Q: Does UCOM 704 work on Windows 11?
A: Yes, but you may need to install an older driver (v3.3.2.105) due to Microsoft’s driver signature changes. ucom 704 driver download free

Q: Do I need a driver for Linux or Mac?
A: No. Both operating systems have built-in support for PL-2303 chips.

Q: Why does my driver download link show “PL-2303” instead of “UCOM 704”?
A: UCOM 704 is a hardware brand. The internal chip is made by Prolific, so you use their driver.

Q: Can I use this for a serial printer, scanner, or CNC controller?
A: Yes. The driver creates a virtual COM port, allowing legacy serial devices to communicate with modern software. Before diving into the download, it’s crucial to

Before installing fresh, purge any ghost drivers.

1. "Device Not Recognized" Error: Try plugging the device into a different USB port. If you are using a USB hub, plug it directly into the motherboard port.

2. Driver Signature Issues (Windows 10/11): If Windows blocks the driver because it is unsigned, you may need to restart Windows in "Disable Driver Signature Enforcement" mode. The internal chipset is typically a Prolific PL-2303

3. Buttons Not Mapping: Ensure you are using the specific UCOM 704 driver, not a generic Windows driver. Uninstall the current driver in Device Manager and re-install using the manual method above.

Prolific’s Windows 10/11 drivers actively block counterfeit chips. To check your adapter:

If you have a counterfeit: Your only option for a ucom 704 driver download free is an older Prolific driver (v3.3.2.25 for Windows 7 compatibility mode) or switching to a different chipset like FTDI or CH340.