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Small rectangular USB to RS232 serial adapter with DB9 connector

SIIG, Inc

SIIG, Inc JU-CS0311-S1 USB to RS232 Serial Adapter

SKU CH-WCAC-18P76 MPN JU-CS0311-S1

Connects a USB port to RS232 serial devices for legacy equipment support

  • Connects USB devices to RS232 serial equipment
  • Enables legacy serial communication through modern USB ports
  • Compact adapter supports reliable data transfer
  • Simple plug-and-play installation for immediate use
  • New condition ensures full manufacturer reliability

USB to RS232 Serial Adapter

This USB to RS232 serial adapter adds a legacy DB9 port to a computer that lacks native serial connectivity. It is intended for engineers, technicians and hobbyists who need to communicate with industrial equipment, networking gear or scientific instruments over a standard RS232 link.

FTDI Chipset for Broad Driver Support

The adapter uses an FTDI chipset, identified by the model code JU-CS0311-S1, which provides native driver support across Windows, macOS and Linux without requiring third-party downloads. This chipset choice is the single specification that determines reliable enumeration and stable throughput for mission-critical serial sessions.

Suits Users with Modern Ports and Legacy Devices

Buyers who need a simple, driver-friendly bridge between a USB-A host and a 232-compliant peripheral will find this unit fits the requirement. Those who require galvanic isolation, multi-port expansion or USB-C native connectivity should look at other solutions.

How it compares

Measured against everything we stock in Miscellaneous PC Accessories, at today’s prices. Recalculated every night.

Price $22.99
Cheaper than about 74% of the 454 comparable items (median $40.99).

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Specifications

Size & build
Shipping weight0.23 kg
Package size152 × 51 × 13 mm

Questions about this item

What does the 16-byte FIFO buffer mean for real-world serial data handling?

The 16-byte FIFO buffer reduces CPU interrupt overhead during high-speed serial transfers, allowing more reliable data flow at higher baud rates without overrun errors.

Which USB standard does this adapter use and what throughput does it cap at?

This adapter uses a USB interface compatible with USB 1.1 and 2.0 ports, capping the signalling rate at USB full-speed levels for serial conversion.

What physical connector does the serial side use for mounting or securing?

The serial side uses a standard DB9 male connector with thumbscrews for secure mounting to equipment or panel cutouts.

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