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Black rectangular adapter with eight DB-9 serial ports and USB connection

SerialGear

SerialGear CM-41082 8-Port DB-9 RS232 USB Adapter Isolation Surge Protection

SKU CH-EP9T-RS2P6

Adds eight RS-232 DB-9 serial ports over USB with 2,500 Vrms optical isolation and surge protection

  • ColorBlack
  • Connector Number8
  • SpecificationsSerial Modes: RS232
  • Adds eight RS-232 DB-9 ports via a single USB connection
  • 2,500 Vrms optical isolation protects equipment from surges
  • Baud rates from 75 bps to 921.6 Kbps suit legacy and modern gear
  • Works with USB 1.0, 1.1 and forward compatible with USB 2.0
  • Powered directly from the USB bus with no external supply needed

Industrial 8-Port RS232 USB Adapter

The SerialGear CM-41082 adds eight DB-9 RS232 serial ports to a PC, thin client or server through a single USB connection. It supports baud rates from 75 bps to 921.6Kbps and provides 2,500Vrms optical isolation with surge protection. The unit operates on USB bus power and is fully compatible with USB 1.0 and 1.1 while remaining forward compatible with USB 2.0. Drivers install automatically for instant COM port expansion.

Suits industrial and legacy equipment integration

This adapter is designed for engineers and system integrators who must connect multiple RS232 devices such as PLCs, sensors, modems or barcode scanners to modern USB-only systems. The optical isolation protects host hardware in electrically noisy environments. Buyers who require signalling standards other than RS232 or who need a different connector format should consider alternative products because this model is limited to eight DB-9 RS232 ports.

2,500Vrms optical isolation rating

The defining specification is the 2,500Vrms optical isolation barrier on each serial port. This level of galvanic separation shields the host computer from ground loops, voltage spikes and transient surges common in factory-floor and outdoor installations. If the application does not demand isolated ports, a simpler non-isolated adapter may be sufficient.

Highlights

  • Adds eight RS-232 DB-9 ports via a single USB connection
  • 2,500 Vrms optical isolation protects equipment from surges
  • Baud rates from 75 bps to 921.6 Kbps suit legacy and modern gear
  • Works with USB 1.0, 1.1 and forward compatible with USB 2.0
  • Powered directly from the USB bus with no external supply needed

Specifications

BrandSerialGear
ModelCM-41082
ColorBlack
Connector Number8
SpecificationsSerial Modes: RS232

Questions about this item

Does the CM-41082 need an external power supply or does it run from the USB port?

The adapter supports USB bus power, so it draws its supply directly from the host USB connection without a separate adapter.

Will the CM-41082 work on a USB 2.0 port even though it is described as compatible with USB 1.0 and 1.1?

Yes, the device is forward compatible with USB 2.0, so it will operate normally when plugged into a USB 2.0 port.

How can I verify that the CM-41082 is providing the stated 2500 Vrms isolation after installation?

Isolation is a factory-rated specification; after driver installation you can confirm the eight COM ports appear in Device Manager and that serial communication functions at the configured baud rate.

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