This article covers StarTech.com シリアル4ポート増設PCIeカード ブレークアウトケーブル付 4x RS232Cシリアルポート(DB9 オス)拡張用PCIe接続ボード PEX4S553B.

Overview

The StarTech.com PEX4S553B is a PCI Express x1 add-on card that provides four RS232C serial ports (DB9 male) via a breakout cable. It is designed for environments where legacy serial equipment—such as industrial controllers, POS terminals, measuring instruments, and professional scanners—needs to be connected to a modern PC that lacks native serial ports. The breakout cable design allows flexible placement of the serial connectors away from the card bracket, simplifying cable management inside the chassis.

Connectivity & Compatibility

This card uses a PCI Express x1 interface compliant with Rev. 1.0a. Each port supports data rates up to 250 kbps with both hardware and software flow control (RTS/CTS, DSR/DTR). It includes both standard and low-profile brackets, making it suitable for standard towers as well as compact 1U servers. The native single-chip design eliminates the need for a bridge chip, improving reliability. Drivers are available for Windows and Linux, though users should verify compatibility with their specific OS version.

Product Info

Market position is entry to mid-range for industrial serial expansion. The price typically falls in the ¥15,000–¥17,000 range, offering good value for multi-port serial needs. The card comes with the breakout cable and both brackets; no driver CD is included. Manufacturer warranty is 2 years. Availability is steady through major e-tailers.

Best Use Cases

Factory or lab environments requiring simultaneous connection of multiple serial devices (PLCs, temperature controllers, barcode scanners). Four ports mean no need for external switchers. Users who need to keep legacy serial peripherals working with modern desktop PCs that lack on-board COM ports. * Not recommended for users who only need one serial port (a USB-to-RS232 adapter is cheaper) or for systems without a free PCIe x1 slot (such as many laptops and mini PCs).

Product Disclosure (Amazon)

  • Manufacturer: StarTech.com(スターテック)
  • ASIN: B004WKTBHW
  • Note: This article covers a manufacturer-made product based on Amazon listing details.