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Black rectangular USB-to-serial adapter with mounting flanges and status LEDs

CoolGear

CoolGear USB-COM-M USB 2.0 to RS-232 Industrial Adapter with Mounting Flanges

SKU CH-YNQK-FXXVR

Adds an industrial RS-232 serial port via USB 2.0 with mounting flanges, full modem signals, 230K bps speed, and LED diagnostics

  • Adapter typeUSB to DB9 (RS-232)
  • Product colorBlack
  • Adds an industrial RS-232 serial port via USB 2.0
  • Full modem control signals with hardware and software flow control
  • Built-in LEDs for power, transmit and receive diagnostics
  • Powered entirely by the USB port, no external adapter needed
  • 9 m USB cable included for flexible placement

Industrial serial expansion

This USB 2.0 to RS-232 adapter adds a DB9 serial port to modern systems lacking native COM ports. It targets engineers and technicians who must connect legacy industrial equipment such as PLCs, CNC machines or serial printers. The metal enclosure and integrated mounting flanges suit DIN-rail or panel installations in harsh environments.

230K bps maximum throughput

The single specification that determines fit is the serial port speed of up to 230K bps with full RS-232 modem control signals and hardware flow control. A 128 byte transmit buffer and 384 byte receive buffer handle bursty data without loss. Buyers needing higher baud rates or multi-port density must select a different device.

0.9 m cable and Windows drivers

A 0.9 metre USB cable is permanently attached so no separate cable purchase is required. The adapter draws power directly from the USB port, eliminating an external supply. Complete drivers install the port as a standard Windows COM port on Windows 7, 8 and 10, enabling immediate use with existing serial terminal software.

How it compares

Measured against everything we stock in USB Adapter Cables & Dongles, at today’s prices. Recalculated every night.

Price $30.99
Pricier than about 88% of the 1,430 comparable items (median $14.99).

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Specifications

Product
Brand nameCoolgear
Model nameUSB-COM-M
Part numberUSB-COM-M
Product colorBlack
Adapter typeUSB to DB9 (RS-232)

Questions about this item

How fast can the serial port actually run once the adapter is plugged into a machine?

The port supports speeds up to 230K bps with a 128 byte transmit buffer and 384 byte receive buffer for reliable data flow.

What USB standard does the adapter use and what does that limit in practice?

It uses USB 2.0 so the serial link is capped at the adapter's 230K bps maximum rather than the bus bandwidth.

How do the mounting flanges attach and what clearance do they need?

Built-in surface mounting flanges let you screw the metal case directly to a panel or chassis with standard screws.

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