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Green Mini PCI-E board with two RJ45 ports and one DB9 serial connector

SMUGDESK

SMUGDESK Mini PCI-E Dual RJ45 Gigabit + COM Serial Combo Card

SKU CH-SPFF-R3FSE

Adds two gigabit RJ45 ports and an RS232 serial port via Mini PCI-E for embedded and industrial boards

  • Adds dual gigabit RJ45 ports plus one RS232 COM port via Mini PCI-E
  • Dual 10/100/1000Mbps Ethernet enables link aggregation and network backup
  • Built-in hardware offload reduces CPU load for steady data transmission
  • Standard RS232 port connects PLCs, barcode scanners and POS equipment
  • Compact Mini PCI-E form factor fits embedded and Mini-ITX boards

Hybrid Expansion Card

This SMUGDESK adapter adds two independent gigabit RJ45 ports and one standard RS232 COM port through a single Mini PCI-E slot. It targets embedded and industrial PCs that lack native LAN and serial connectivity. The compact board fits Mini-ITX and space-constrained motherboards. Driver support covers Windows and mainstream Linux distributions for plug-and-play deployment.

Dual Gigabit Plus Serial

The dual Ethernet ports operate at 10, 100 or 1000Mbps with auto-adaptive speed negotiation. Hardware offload reduces CPU load during sustained transfers, while link aggregation and network backup provide redundancy. The RS232 port connects PLCs, barcode scanners, POS terminals and instrumentation at standard serial rates. Anti-interference PCB shielding stabilises both network and serial signals.

Embedded-Friendly Integration

The Mini PCI-E form factor suits compact enclosures and industrial control cabinets where internal space is limited. No additional power connector is required beyond the slot itself. The card resolves the common shortage of native LAN and COM ports on embedded boards without occupying extra expansion slots. It serves as a cost-effective upgrade for NAS units, automation controllers and other embedded devices.

How it compares

Measured against everything we stock in Network Adapters & RJ45 Plugs, at today’s prices. Recalculated every night.

Price $24.99
Pricier than about 62% of the 1,221 comparable items (median $19.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Will the dual 10/100/1000Mbps RJ45 ports work on an older Mini-ITX motherboard that only has a single Mini PCI-E slot?

Yes, the card fits a standard Mini PCI-E slot and provides two independent gigabit Ethernet ports plus one RS232 COM port, adding both network links and a serial port without needing extra slots.

How can I verify the RS232 COM port is communicating correctly with my PLC after installing the driver?

Open Device Manager, confirm the new COM port appears, then use a terminal program at the matching baud rate to send a test command and watch for the expected reply from the PLC.

Does the package include any cables or brackets, or do I need to source a low-profile bracket and serial cable separately?

The card itself is supplied; a low-profile bracket and any DB9 serial cable or Ethernet patch leads must be purchased separately to complete the installation.

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