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Green PCIe expansion card with two DB9 serial ports and a metal bracket

SMUGDESK

SMUGDESK PCIe Dual DB9 RS232 Serial Card 2-Port COM Port Expansion Adapter

SKU CH-NH1T-GG1GJ

Adds two DB9 RS232 serial ports via PCIe for PLC, POS and industrial equipment

  • Adds two DB9 RS232 ports for PLC and industrial gear
  • Fits PCIe x1, x4, x8 or x16 slots on mainstream boards
  • Professional serial chip keeps data stable in industrial settings
  • Works with desktop, industrial host, monitoring and automation systems
  • Plug-and-play on Windows and Linux with no extra drivers

Industrial COM Expansion

The SMUGDESK PCIe card adds two independent DB9 RS232 ports to a desktop or industrial PC. It connects PLCs, POS terminals and instrumentation that still rely on legacy serial links. The board uses a standard PCIe x1 edge connector that seats in x1, x4, x8 or x16 slots. Windows and Linux systems recognise it without extra drivers.

Thermals Noise Power

The adapter draws minimal power from the PCIe slot and has no active cooling. Passive operation keeps the system completely silent during data transfers. Low heat output means it does not raise chassis temperatures in compact industrial enclosures. Stable signal quality is maintained across the supported baud rates of 16 and 232.

Build Integration

One free PCIe slot of any width is the only installation requirement. The low-profile bracket fits standard and slim chassis without blocking adjacent slots. Two DB9 cables can be routed cleanly to the rear panel or internal equipment. No external power cable or software configuration is needed, freeing up both power connectors and setup time.

How it compares

Measured against everything we stock in Interface & Card Adapters, at today’s prices. Recalculated every night.

Price $34.99
Pricier than about 80% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How do I install this PCIe x1 card and which step is most often missed?

Insert the card into any PCIe x1/x4/x8/x16 slot, secure the bracket screw, then install the driver for Windows or Linux before connecting DB9 cables.

What maintenance will the two DB9 ports need over time?

Periodically check the DB9 screws for tightness and clean the pins with contact cleaner if signal errors appear after long industrial use.

What limit appears first when both COM ports run continuously at 232 kbps?

The shared PCIe x1 bandwidth and single control chip become the bottleneck before the individual RS232 ports reach their maximum rate.

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