Call us now toll free: (888) 688-2188

My Cart:

0 item(s) - $0.00
You have no items in your shopping cart.


USB2-4COM-SI-M - 4-Port RS-232 USB-to-Serial Adapter, with Optical-isolation and Surge Protection, Metal Case Protection, Metal Case


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. The optical isolation protects your computer from spikes and surges.

Availability: In stock



The USB2-4com-si-m 4 port USB to RS232 DB9 Serial port has Optical Isolation and Surge Protection all housed in a professional Metal Case that can be Surface mounted. Great for Labs, Medical applications, Camera control, Amateur Radio and many other RS232 Applications with the safety of Opto isolation for you peace of mind!

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.

  • 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 power supply included
  • 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 10, 8, Windows 7, Vista, 2003, XP, 2000 and Linux

Operating Temperature 0 to 55 °C (32 to 131 °F)
Operating Humidity 5 to 95% RH
Storage Temperature -20 to 75 °C (-4 to 167 °F)
Safety Approvals CE, FCC



Additional Information

UPC 729440690786
Manufacturer SerialGear
Length No
Color Beige
OS Support Linux, Win 7, Win 8/8.1, Win Vista, Win XP

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.