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Black USB to serial adapter cable with DB9 connector

Ruth's sister

Ruth's sister CH340 USB to RS232 Serial Cable 9 Pin DB9

SKU CH-RXJ4-XFR85

USB-to-RS232 adapter with CH340 chip and 9-pin DB9 connector for serial COM-port connectivity

  • Adds a serial port via USB with CH340 chip
  • Converts USB to RS232 for legacy DB9 devices
  • Supports Windows 7 for broad compatibility
  • Ready to connect industrial or networking gear

CH340 USB to RS232 serial adapter

This cable converts a USB port into a standard RS232 DB9 serial connection using the CH340 chipset. It enables modern computers without built-in COM ports to communicate with legacy industrial equipment, networking hardware, or scientific instruments. The adapter supports Windows 7 and later operating systems for broad compatibility.

Replaces missing native serial ports

The jump is worth it when a laptop or desktop lacks a physical DB9 port but must configure routers, switches, PLCs, or older medical devices. It is not for buyers who need USB-to-USB bridging, parallel port emulation, or multi-port serial expansion beyond a single DB9 connection.

How it compares

Measured against everything we stock in RS-232 Serial Cables, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 94% of the 93 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What type of port does the 9-pin DB9 connector on this cable plug into?

The 9-pin DB9 connector plugs into a standard RS232 serial port on your device.

Which driver must be installed before the CH340 adapter appears as a COM port in Windows 7?

Install the CH340 driver package first; without it the cable will not create a virtual COM port in Device Manager.

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