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Green PCI circuit board with two serial ports and ribbon cable

SIIG, Inc

SIIG, Inc JJ-P20211-S6 2-Port 16550 Serial PCI Expansion Card

SKU CH-4DQF-43H4D MPN JJ-P20211-S6

Adds two 16550 serial ports via 32-bit PCI with optional 5V or 12V power output

  • External connectors2 x Serial Ports
  • Transfer speedUp to 230 kbit/s
  • Supported operating systemsWindows 95/98/98 SE/ME/NT4.0/2000/XP/Server 2003
  • Product typePCI to Serial Port Card
  • DetailsRegulatory approval(s): FCC Class B (DoC) & CE RoHS complian
  • Key featuresSupports 32-/64-bit, 3.3 V/5 V PCI and PCI-X slots Two high-
  • Adds two high-speed 16550 serial ports for legacy device connectivity
  • Data rates up to 230 Kbps ensure fast serial communication
  • Fits 32-bit and 64-bit PCI slots at 3.3V or 5V
  • Includes standard and low-profile brackets for any case
  • Ports supply 5V or 12V power for POS displays and scanners

Two 16550 Serial Ports via PCI

This card adds two 9-pin RS-232 ports to a desktop through a 32-bit PCI slot. It targets industrial and POS users who need to connect legacy serial devices such as barcode scanners, displays or modems. The 16550 UART with 32-byte FIFO buffers supports data rates up to 230 Kbps. Both standard and low-profile brackets are included for flexible case mounting.

Replaces Onboard or Single-Port Serial

Upgrading from a single onboard COM port or a one-port expansion card is worthwhile when two simultaneous serial links are required for data gathering or point-of-sale equipment. The jump also makes sense when 5 V or 12 V power output on the ports is needed for peripheral operation without extra adapters. Systems lacking any native serial header benefit immediately.

Sustained Operation with IRQ Sharing

Built-in IRQ sharing reduces conflicts during continuous multi-port communication, while the 32-byte FIFO buffers maintain throughput under steady load. The card operates in 3.3 V or 5 V PCI and PCI-X slots, supporting Windows 95 through Server 2003 for long-term deployment in legacy environments. FCC Class B and CE compliance ensures stable electromagnetic behaviour.

How it compares

Measured against everything we stock in PCIe Expansion Cards, at today’s prices. Recalculated every night.

Price $38.99
Pricier than about 62% of the 891 comparable items (median $30.99).

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Specifications

Product
Brand nameSIIG
Model nameJJ-P20211-S6
Product typePCI to Serial Port Card
Performance
Transfer speedUp to 230 kbit/s
Ports & slots
External connectors2 x Serial Ports
Size & build
Shipping weight1.36 kg
Package size203 × 152 × 51 mm
Compatibility
Supported operating systemsWindows 95/98/98 SE/ME/NT4.0/2000/XP/Server 2003
In the box
In the boxDual profile PCI 2S board
Mini 2-port fan-out cable

Questions about this item

Which brackets are included for mounting the card in a standard or low-profile case?

The card ships with both standard and low-profile mounting brackets so it can be installed in almost any chassis.

What is the most common mistake when installing the card in a 32-bit PCI slot?

Forgetting to attach the mini fan-out cable to the card before securing the bracket leaves the serial ports inaccessible.

Will the 16550 UART ports need any firmware updates or capacitor replacements over time?

No firmware or capacitor maintenance is required; the ports operate as standard RS232 interfaces for the life of the card.

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