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4-Port RS-232 USB to Serial Adapter - with Optical isolation - Surge Protection


Quick Overview

Optical isolation and surge protection are available on serial port and is individually optically isolated with 2000 volt DC optical isolation on 8 signal pins, GND is isolated by 5V DC-to-DC converter. (GND cannot be isolated by photo-coupler.) meets the high level of optical isolation. The optical isolation protects your computer from spikes and surges, by converting the electrical pulse into an optical signal and then changing it back into an electrical pulse.

Availability: Out of stock


Manufacturer: USBGear


The USB Serial Adapter is designed with Optical Isolation and Surge Protection with an industrial-grade metal chassis to make and keep serial port expansion safe for your devices. The USB2-4COM-SI-M can connect to a USB port or USB hub to instantly add 4 serial communication ports to your system. The 4-Port USB 2.0 Serial Adapter makes it easy to add serial port and serial device to your system with easy plug-and-play and hot plug features and adapts easily to new technology.

No Communication Conflicts!

There are no IRQ & COM port conflicts, since the port doesn't require any additional IRQ, DMA, memory as resources on the system. The RS-232 port functions as native Windows COM port, and it is compatible with Windows serial communication applications. Each port is individually configurable.

USB 2.0 RS232 4-Port Serial Features:

  • Adds four industrial RS-232 serial ports with optical isolation by connecting to a USB port
  • 2000V DC optical isolation
  • 25KV ESD surge protection
  • Installed as standard Windows COM port
  • SECC metal chassis with DIN rail bracket
  • Full RS-232 modem control signals and hardware/software flow control
  • RS-232 data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND
  • High speed serial port with the baud rate up to 921.6K bps
  • 128 byte transmit FIFO & 384 byte receive FIFO
  • Non-standard baudrates supported
  • LEDs of Power, TxD and RxD for easy port monitoring and diagnostics
  • Serial port protected with surge protection of 25KV
  • Terminal power adapter of 5V, 2A provided
  • Easy plug and play installation and RS-232 device connection
  • COM port number assigned can be changed to any COM port number required
  • Works with USB 1.1 & 2.0 host port
  • Supports Windows 8, Windows 7, Vista, 2003, XP, 2000 and Linux

The USB 2.0 4 Port Serial Adapter with Metal Chassis provides instant connectivity to RS-232 communication devices for factory automation equipment, multi-drop data collection devices, barcode readers, time clocks, scales, data entry terminal and serial communication in harsh environment and is suitable for remote access applications requiring high speed RS-232 communication ports.

Optical Isolation and Surge Protection

Your computer is well protected, since the surges and spikes cannot cross the optical link. Each serial port is individually protected by surge protector to withstand electrostatic discharge and power surges up to 25KV ESD. Surge suppression on all signals prevent from damages caused by lightning or high voltage.

Additional Information

Part Number USB2-4COM-SI-M
UPC 729440690786
Manufacturer USBGear
Color Beige
Tech Notes The RS-232 Adapter's DB-9 connectors are Optically Isolated in pins 1 through 9 however, GND is isolated by 5V DC-to-DC converter. The GND pin cannot be isolated by the photo-coupler.
Connectors DB-9, USB B Male
Material Metal
External Interface USB 2.0
DB9 Gender Male (pins)
DB9 Screws or Nuts Hex Nuts
Warranty One Year