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Black USB-to-serial adapter box with DIN rail clip and 1 m octopus cable splitting to four DB9 ports

SerialGear

SerialGear USB2-4COM-M-CBL 4-Port USB 2.0 to RS-232 Serial Cable with 1m Octopus Breakout & DIN Rail

SKU CH-KMYK-ETW50

Adds four industrial RS-232 ports via a single USB 2.0 link with a 1 m octopus breakout to DB9 connectors, DIN-rail mountable metal chassis, 921.6 Kbps maximum baud rate.

  • Connector detailsUSB 2.0 Type-B Female to Male DB37 w/ breakout cbl
  • Product colorBlack
  • DetailsSerial Modes: RS232
  • Compact DIN-rail mounting saves cabinet space
  • Four DB9 ports from one USB 2.0 connection
  • 6K bps with deep FIFOs for fast data
  • 10 kV surge protection guards connected equipment
  • USB bus power means no extra adapter needed

Compact Industrial Serial Expansion

The SerialGear USB2-4COM-M-CBL adds four industrial RS-232 ports through a single USB 2.0 connection. It targets engineers and technicians who need reliable serial communication with legacy PLCs, meters, or automation equipment. The adapter installs as standard Windows COM ports without IRQ or resource conflicts. No external power supply is required.

DIN Rail Mounting and Octopus Breakout

A SECC metal chassis includes a DIN rail bracket for secure cabinet installation. The 1 m octopus cable fans out from a male DB37 connector to four DB9 ports, keeping wiring tidy inside panels. Each port provides full RS-232 signals including TxD, RxD, RTS, CTS, DSR, DTR, DCD and GND. LEDs for power, TxD and RxD give instant visual diagnostics.

Surge Protection and High Speed FIFOs

Each serial port is guarded by 10 kV surge protection for harsh electrical environments. Hardware and software flow control plus non-standard baud rates up to 921.6 K bps ensure compatibility with demanding devices. The 128 byte transmit and 384 byte receive FIFOs reduce CPU overhead during heavy traffic. This adapter replaces bulky multi-port PCI cards when only USB host interfaces are available.

How it compares

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

Price $75.99
Pricier than about 87% of the 93 comparable items (median $21.99).

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Specifications

Product
Brand nameSerialGear
Model nameUSB2-4COM-M-CBL
Product colorBlack
Ports & slots
Connector detailsUSB 2.0 Type-B Female to Male DB37 w/ breakout cbl

Questions about this item

What practical throughput does the USB 2.0 link cap the four RS-232 ports at?

The USB 2.0 connection limits aggregate throughput, while each serial port can signal up to 921.6 Kbps with 128 byte transmit and 384 byte receive FIFOs.

What physical mounting does the metal chassis need?

The SECC metal box includes a DIN rail bracket for direct mounting on standard DIN rails.

How is the adapter installed and what step is often missed?

Plug the USB 2.0 Type-B cable into the host; Windows installs four standard COM ports automatically — just verify each port number in Device Manager before configuring your serial software.

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