OIKWAN USB-C to Serial Adapter Review: Professional Connectivity Solution 2025

Serial adapters sit in that peculiar niche where most people never need one, until they absolutely do. Whether you’re configuring network switches, accessing server consoles, or working with industrial equipment, RS232 connectivity remains essential in 2025. The market offers dozens of USB-C to serial adapters ranging from dubious £8 dongles to £40+ professional units. I’ve spent several weeks testing the OIKWAN adapter across multiple scenarios and devices to determine where it sits in that spectrum. Here’s what actually matters when you’re choosing one of these.

The driver situation on Mac is a minor annoyance but not unexpected. Most CH340-based adapters require manual driver installation on macOS due to Apple’s security requirements. Once installed, it works fine. Windows and Linux users won’t encounter this friction at all.

The occasional need to reconnect on initial device detection is mildly annoying but not a dealbreaker. Once connected, the adapter maintains stable communication reliably.

One thing worth noting: I tested this with PuTTY on Windows, screen on Linux, and CoolTerm on macOS. All three terminal emulators worked without issues. The adapter presents itself as a standard COM port (Windows) or /dev/ttyUSB device (Linux), which means compatibility with virtually any serial communication software.

The 1.5m cable length is about right, long enough to reach from laptop to equipment rack without being unwieldy. The cable itself has decent flexibility without feeling flimsy. I’ve bent and flexed it repeatedly during testing without any signs of internal wire damage.

My main concern is the USB-C connector housing. It’s plastic rather than metal, and whilst it feels solid enough for now, I wonder how it’ll hold up after hundreds of insertion cycles. The DB9 end inspires more confidence with its metal shell and proper thumbscrews.

One small frustration: Windows sometimes assigns a high COM port number (COM15 or higher) on first connection, which can cause issues with older software that only recognises COM1-COM9. You can manually reassign it in Device Manager, but this is a minor faff.

The Startech adapter costs nearly twice as much but uses the superior FTDI chipset, which offers better driver support and higher baud rates. If you’re working in an enterprise environment where reliability is paramount, that premium is worth paying. But for most users, the OIKWAN delivers 90% of the performance at half the cost.

The UGREEN alternative is slightly cheaper but has a reputation for driver headaches, particularly with the Prolific chipset and counterfeit chip issues. I’d rather pay a few quid more for the OIKWAN’s better consistency.

At this price point, you’re getting solid performance and adequate build quality without paying for premium chipsets or enterprise-grade construction. The OIKWAN delivers better reliability than sub-£10 adapters whilst remaining affordable for occasional professional use. If you need this adapter daily in demanding environments, spending more on a Startech or Tripp Lite unit makes sense. For periodic console access and equipment configuration, this hits the sweet spot.

The value proposition is straightforward: you’re getting dependable serial connectivity without premium pricing. The CH340 chipset has matured significantly over the years and now offers reliability that was previously only available in more expensive FTDI-based adapters. For IT professionals who need serial access occasionally rather than constantly, this represents excellent value.

I’d happily throw this in my laptop bag for client site visits. It’s reliable enough for professional use but affordable enough that I wouldn’t be devastated if it got lost or damaged. That’s precisely the sweet spot for a tool like this.