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Green PCB PCI card with two DB-9 serial ports and low-profile bracket

SIIG, Inc

SIIG, Inc JJ-P20211-S7 Dual Profile PCI 2-Port RS232 Serial Expansion Card

SKU CH-8Q2D-BF96Z MPN JJ-P20211-S7

Adds two 16550 UART serial ports via universal PCI with a low-profile bracket included

  • Product typePCI to Serial Port Card
  • Key featuresUniversal PCI card design that works in 32-/64-bit, 3.3 V/5
  • Product dimensions5.12 in (W) × 4.72 in (H) × 0.79 in (D)
  • Product weight0.13 lb (0.06 kg)
  • Adds two high-speed 16550 UART serial ports to a desktop PC
  • Universal PCI design works in 32-bit, 64-bit, 3.3V and 5V slots
  • Dual-profile bracket fits standard-height and low-profile chassis
  • Each port configurable for 5V or 12V power output for serial devices
  • RoHS compliant with 32-byte FIFO buffers per port

Dual-Profile PCI Serial Card

The SIIG JJ-P20211-S7 adds two 9-pin DB-9 RS-232 ports to a desktop through a universal PCI slot. It uses a 16550 UART with 32-byte FIFO buffers and supports both 3.3V and 5V PCI or PCI-X buses. A low-profile bracket is included for compact chassis installations.

Check Slot And Port Needs

Verify the motherboard has a free 32-bit or 64-bit PCI or PCI-X slot before ordering. Confirm that your serial devices use 9-pin DB-9 connectors and require standard RS-232 signalling. The card also offers a single 25-pin DB-25 external port for alternate cabling.

Replaces Legacy Onboard Ports

This adapter upgrades systems that lack native serial headers or need additional COM ports for industrial equipment. The jump is worth it when legacy software or hardware demands true 16550 UART compatibility with configurable 5V or 12V power output on each port.

How it compares

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

Price $35.99
Pricier than about 58% of the 891 comparable items (median $30.99).

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Specifications

Product
Brand nameSIIG
Model nameJJ-P20211-S7
Product typePCI to Serial Port Card
Size & build
Product dimensions5.12 in (W) × 4.72 in (H) × 0.79 in (D)
Product weight0.13 lb (0.06 kg)
Shipping weight0.91 kg
Package size178 × 152 × 51 mm

Questions about this item

Does the card ship with both brackets so I can fit it in a low-profile case?

Yes, the package includes a spare low-profile bracket alongside the standard bracket so the card can be installed in either chassis style.

How do I decide between using the 25-pin or 9-pin ports on the back panel?

The card provides one DB-25 and two DB-9 connectors; choose the DB-25 for legacy equipment that needs it and the DB-9 ports for modern serial cables.

What does the 16550 UART with 32-byte FIFO do for my serial devices?

The 16550 UART and 32-byte FIFO buffer reduce processor overhead and help prevent data loss during high-speed serial transfers.

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