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Green PCB expansion card with two silver DB9 ports on a silver bracket

SMUGDESK

SMUGDESK PCIe to 2-Port DB9 RS232 Serial Card AX99100

SKU CH-WJ64-HE971

Adds two DB9 RS232 COM ports via one PCIe slot using the AX99100 chip for industrial serial devices

  • Adds two DB9 RS232 COM ports via one PCIe slot
  • AX99100 chip supports long-term continuous data transmission
  • Standard RS232 protocol fits POS, PLC and serial debugging devices
  • Fits PCIe x1, x4, x8 and x16 slots on desktop motherboards
  • Drivers included for Windows and Linux systems

Dual-port serial card for industrial equipment

This PCIe expansion card adds two independent DB9 RS232 COM ports to a desktop computer. It uses the AX99100 control chip to maintain stable serial communication over long periods. The standard bracket fits PCIe x1, x4, x8 or x16 slots on most motherboards. Drivers are provided for Windows and Linux operating systems.

Suits technicians restoring legacy serial links

The card is built for engineers connecting POS terminals, PLCs, detection instruments or serial debuggers that still rely on RS232 signalling. It is not intended for users who need USB, parallel or Ethernet interfaces, nor for laptops or small-form-factor systems lacking a full-height PCIe slot.

AX99100 chip enables two 16-byte FIFO ports

Each DB9 port presents a 16-byte transmit and receive FIFO managed by the AX99100 controller, supporting standard RS232 voltage levels and baud rates up to 232 Kbps. This hardware buffering is the specification that determines whether the card can sustain continuous data streams without overrun errors.

How it compares

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

Price $23.99
Pricier than about 57% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What PCIe slot size does this card need on my motherboard?

It fits any PCIe x1, x4, x8 or x16 slot on a standard desktop motherboard.

Will the AX99100 chip work with my older RS232 instruments?

The card uses standard RS232 protocol, matching POS terminals, PLCs and detection equipment.

How can I verify both COM ports are active after installing the driver?

Open Device Manager on Windows or check dmesg on Linux to see two new serial ports listed.

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