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Green PCIe card with four silver DB9 ports and a red power jumper block

SMUGDESK

SMUGDESK 4-Port PCIe RS232 Serial Expansion Card with 5V/12V Power Output

SKU CH-6J8B-RZNJ8

Adds four DB9 RS232 COM ports with selectable 5V/12V power for industrial serial devices via a PCIe x1 slot

  • Adds four DB9 RS232 COM ports with selectable 5V/12V power
  • PCIe x1 card fits x1/x4/x8/x16 motherboard slots
  • Optimized chip ensures stable data for PLCs and sensors
  • Ready for industrial PCs, POS terminals and legacy gear
  • Works with Windows and Linux for quick plug-and-play setup

Four independent DB9 RS232 COM ports

This SMUGDESK expansion card adds four DB9 serial ports through a single PCIe x1 slot, each port configurable to supply 5V or 12V power for external serial peripherals. It targets system integrators maintaining industrial control equipment, point-of-sale terminals or legacy hardware that still relies on RS232 connectivity.

Standard PCIe x1 form factor fits all slot widths

The card installs in any PCIe x1, x4, x8 or x16 motherboard slot without adapters, freeing legacy ISA or proprietary serial headers for other uses. Mainstream Windows and Linux distributions recognise the device on boot, so no proprietary driver packages are required for basic operation.

Optimised serial chip sustains stable

Under continuous load the onboard controller maintains reliable data transmission across all four ports simultaneously, preventing drop-outs during long PLC polling cycles or sensor logging sessions. Selectable pin power stays within specification even when multiple powered devices draw current at once.

How it compares

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

Price $38.99
Pricier than about 82% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Will the four DB9 COM ports maintain stable communication when all channels run continuously?

The optimized serial chip is designed for stable communication across all four independent DB9 RS232 COM ports during sustained multi-channel use with PLCs, sensors and industrial automation hardware.

Does the card generate noticeable heat or noise when installed in a PCIe x1 slot and left running all day?

The standard PCIe x1 form factor has no active cooling, so it operates silently; heat output stays low because the board only powers the serial logic and optional 5V/12V pin power for external devices.

What motherboard slot and operating system do I need before installing this card?

You need a free PCIe x1, x4, x8 or x16 slot and a mainstream Windows or Linux system for plug-and-play operation.

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