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Green PCIe card with two DB9 ports and metal bracket

STARTECH

STARTECH PEX2S953 2 Port PCIe RS232 Serial Adapter Card

SKU CH-863G-DZBQD MPN PEX2S953

Adds two RS232 serial ports via a PCI Express 1.1 slot, supporting 921.6K bps with 256-byte FIFO and optional low-profile bracket

  • Add two serial ports via PCIe 1.1 slot
  • 6K bps max speed with 16950 UART
  • 256-byte FIFO buffers reduce CPU load
  • Low-profile and full-profile brackets included
  • Asix AX99100 chipset with broad OS support

Dual RS232 PCIe Adapter Card

The StarTech PEX2S953 adds two DB9 serial ports through a PCI Express slot. It suits IT technicians and industrial users who need native‑style COM ports for legacy equipment such as printers, PIN pads or modems. The card uses an Asix AX99100 chipset and delivers baud rates up to 921.6K bps. A 256‑byte FIFO buffer per port helps maintain data integrity.

Verify Slot And Bracket Fit

Confirm your system has a free PCI Express slot compliant with the 1.1 specification. The package includes both full‑profile and low‑profile brackets, so choose the bracket that matches your chassis form factor before installation. External power must be connected if you require 5 V or 12 V output on pin 9 of the DB9 connectors. Ensure your operating system is among the supported Windows or Linux releases.

Direct Replacement For PEX2S952

This model replaces the earlier PEX2S952 with the same two‑port layout and 16950 UART compatibility. The upgrade is worthwhile when you need the included low‑profile bracket option or prefer the AX99100 chipset for current driver support. It does not add extra ports beyond the pair, so buyers needing more than two serial connections should look elsewhere.

Points forts

  • Add two serial ports via PCIe 1.1 slot
  • 6K bps max speed with 16950 UART
  • 256-byte FIFO buffers reduce CPU load
  • Low-profile and full-profile brackets included
  • Asix AX99100 chipset with broad OS support

Caractéristiques

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Questions sur cet article

Does the PEX2S953 card include both full-profile and low-profile brackets in the box?

Yes, the card ships with a pre-installed full-profile bracket and optional low-profile brackets for small-form-factor cases.

Should I choose the PEX2S953 or the older PEX2S952 for a new build?

The PEX2S953 is the direct replacement for the PEX2S952 and uses the same AX99100 chipset with PCIe 1.1 compliance.

What does the 921.6K bps rating mean when the card is installed in a PCIe 1.1 slot?

Each of the two DB9 ports can transfer serial data at up to 921.6K bps with 256-byte FIFO buffers per channel.

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