This article covers StarTech.com RS232Cシリアルアダプターカード.
Overview
The StarTech.com PEX1S553LP is a PCI Express x1 serial adapter card that adds a single RS232C port to a desktop PC or server. Based on the ASIX MCS9922CV-AA controller with 16550 UART, it supports bidirectional communication up to 460.8 Kbps and includes a 256-byte FIFO buffer for reliable data transfer. This card is designed for industrial and commercial environments where legacy serial devices remain essential: PLCs, POS terminals, scientific sensors, medical equipment, and oscilloscopes. It ships with a low-profile bracket pre-installed and includes a standard bracket in the box, making it compatible with everything from compact chassis to full-tower cases.
Connectivity & Compatibility
The interface is PCI Express x1. The card works with Windows and Linux, and drivers are often included in the OS, requiring no additional installation. It provides one DB9 male port with full RS232 signal support (TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, GND). Pin 9 power output can be set to 12V, 5V, or disabled via jumper. Both low-profile and standard brackets are included, so the card fits any case with an available PCIe slot, regardless of form factor.
Product Info
Released around 2010, the PEX1S553LP remains widely available as a reliable long-seller. Pricing on is approximately ¥9,187. StarTech.com backs it with free, unlimited technical support for IT professionals. Market positioning is entry to mid-range. With a single port, it offers exactly what many industrial setups need without extra cost. Compared to USB-to-serial adapters, the direct PCIe connection provides lower latency and greater stability.
Best Use Cases
This card is ideal for engineers and technicians who need to connect serial devices to a desktop PC in factories, labs, or server rooms. If you have experienced driver issues or port recognition problems with USB serial adapters, a PCIe card is a more reliable solution. It is also perfect for users who want to keep legacy measurement or control equipment running on modern Windows or Linux systems. The low-profile bracket makes it suitable for compact industrial PCs and 1U servers. Note: For laptops or tablets, a USB serial adapter is the appropriate choice. This card is strictly for desktop PCs with an available PCIe slot.
Product Disclosure (Amazon)
- Manufacturer: StarTech.com(スターテック)
- Seller: Startech Japan KK
- Fulfilled by: Amazon
- ASIN: B0041ULUX6
- Note: This article covers a manufacturer-made product based on Amazon listing details.
