We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black rectangular metal USB-to-DB9 adapter with mounting flanges and LED indicators

CoolGear

CoolGear USBG-COM-SI-M USB 2.0 to RS-232 Optical Isolation Adapter

SKU CH-VXJD-PBATE

Adds an isolated RS-232 serial port via USB with 2000V optical isolation and 25KV ESD protection

  • ColorBlack
  • Changer TypeUSB to DB9 (RS-232)
  • Adds an isolated RS-232 port via USB 2.0
  • 2000V DC optical isolation protects connected equipment
  • Industrial metal housing with surface-mount flanges
  • Supports full RS-232 modem signals and flow control
  • Works with Windows, Linux and Mac OS 10.X

Industrial USB-to-RS-232 adapter

The CoolGear USBG-COM-SI-M adds a single DB9 serial port to any computer through a standard USB connection. It draws power directly from the USB port and requires no external supply. The industrial metal housing includes surface-mounting flanges and is compatible with DIN rail clips sold separately.

Suited for legacy equipment integration.

This adapter suits engineers and technicians connecting PLCs, meters or industrial machinery that rely on full RS-232 modem control signals. Optical isolation of 2000V DC and 25KV ESD surge protection shield both the host and the device. Buyers who need more than one serial port should look at a different solution.

2000V DC optical isolation decides fit

The defining specification is the 2000V DC optical isolation combined with 25KV ESD surge protection. If your application demands galvanic separation between the USB host and the RS-232 device, this unit meets that requirement. Without that need, a simpler non-isolated converter may be adequate.

Highlights

  • Adds an isolated RS-232 port via USB 2.0
  • 2000V DC optical isolation protects connected equipment
  • Industrial metal housing with surface-mount flanges
  • Supports full RS-232 modem signals and flow control
  • Works with Windows, Linux and Mac OS 10.X

Specifications

BrandCoolgear
ModelUSBG-COM-SI-M
ColorBlack
Changer TypeUSB to DB9 (RS-232)

Questions about this item

Should I choose this adapter for a single RS-232 port or do you offer a multi-port version?

The USBG-COM-SI-M adds one industrial RS-232 serial port with optical isolation. No multi-port version of this model is listed.

What does the 921.6 Kbps baud rate mean for my legacy equipment?

The adapter supports speeds from 300 bps up to 921.6 Kbps with 512 byte transmit and receive FIFOs, matching most industrial RS-232 devices.

Will the USB 2.0 connection limit the 921.6 Kbps throughput in practice?

The USB 2.0 interface provides ample bandwidth for the 921.6 Kbps serial rate, so the port runs at its full specified speed.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.