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Black metal box with eight DB9 ports and DIN rail bracket

SerialGear

SerialGear USB-8COMi-RM USB to Octal RS-232/422/485 adapter DIN rail rack mount

SKU CH-5XAS-EES4F

An eight-port USB serial adapter that adds RS-232, RS-422 or RS-485 COM ports with external DIP-switch mode selection and a built-in 100-240 V power supply.

  • ColorBlack
  • Changer TypeUSB to DB9 (RS-232)
  • Eight ports add RS-232/422/485 serial connectivity to a USB host
  • External DIP switches select each port mode without opening the chassis
  • Built-in 100-240 V switching supply powers all eight ports
  • DIN rail bracket and 19 rack-mount kit give flexible industrial mounting
  • Full RS-232 modem signals with hardware and software flow control

Eight-port serial adapter for industrial integration

The USB-8COMi-RM adds eight independent RS-232, RS-422 or RS-485 COM ports to a host system over a single USB connection. Each port is configured through its own external 4-pin DIP switch, so mode changes require no chassis disassembly. The unit installs as standard Windows COM ports and includes both DIN rail brackets and 19 rack-mount kits for flexible deployment in cabinets or enclosures.

Sustained operation with built-in power supply

A 100V-240V internal switching supply powers all eight ports without drawing current from the USB bus, preventing voltage drop during long cable runs or multi-drop networks. Full RS-232 modem control signals and hardware or software flow control are maintained on every channel, while automatic transmit/receive handling keeps 2-wire RS-485 half-duplex links stable under continuous load. Termination and biasing options further protect signal integrity in electrically noisy environments.

Replaces multiple single-port converters

One USB-8COMi-RM consolidates up to eight separate USB-to-serial dongles or internal expansion cards, reducing cabling, driver instances and points of failure. The jump is worth it when a PLC, barcode scanner array, POS cluster or factory automation cell needs several serial links with independent mode selection and reliable power. It is not suited for applications that require only one or two ports, or for systems lacking a free USB host connection.

Highlights

  • Eight ports add RS-232/422/485 serial connectivity to a USB host
  • External DIP switches select each port mode without opening the chassis
  • Built-in 100-240 V switching supply powers all eight ports
  • DIN rail bracket and 19 rack-mount kit give flexible industrial mounting
  • Full RS-232 modem signals with hardware and software flow control

Specifications

BrandCoolgear
ModelUSB-8COMi-RM
ColorBlack
Changer TypeUSB to DB9 (RS-232)

Questions about this item

Does the built-in 100-240 V power supply make the unit run hot or noisy during all-day operation?

The adapter uses a built-in switching supply rated 100-240 V with no fan, so it stays cool and silent even when all eight ports run continuously.

What must I already have to connect this adapter to my computer?

You need a free USB port on the host PC and a standard USB cable; the unit installs as a regular Windows COM port with no extra hardware.

Will my legacy RS-232, RS-422 and RS-485 devices all work at once on the eight DB9 ports?

Each port has its own 4-pin DIP switch, so you can set any mix of RS-232, RS-422 or RS-485 modes side-by-side and run older gear together.

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