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Expert Opto Bridge 0404

Interface isolation for USB/RS232

Expert Opto Bridge 0404 is a transmitter for USB and RS232 interface. It enables a galvanic isolation of devices with USB and serial interface and the PC.


Expert Opto Bridge 0404


  • Overvoltage protection by galvanic isolation
  • Isolation voltage max. 2500 V
  • Data transfer rate up to 115.200 Baud
  • LED for signalling Receive/Transmit Data
  • Easy to set up
  • Made in Germany


  • Overvoltage protection by galvanic isolation
  • Isolation voltage max. 2500 V
  • Serial input voltage

      -15 V to -6 V for logical 1
      +15 V to +6 V for logical 0

  • Data transfer rate up to 115.200 Baud
  • Easy installation through virtual COM port
  • For Windows and Linux systems (from Kernel 2.6)
  • In addition to the data lines (receiver and transmitter lines), two handshake lines are supported in both directions (RTS/CTS)
  • LED status monitor for RxD/TxD
  • Developed and manufactured in Germany
RS232 interfaceUSB interface
Electrical Connections
1 serial interface RS232 Sub-D plug (9-pin) for device connection (power supply through USB interface)
1 cable with USB-A plug for PC connection
USB 2.0 full speed (12 Mbit/s)
Technical Details
Plastic case
LxHxW: 77 x 24 x 42 mm
Weight: ca. 55 g
Cable length: ca. 40 cm
Operating temperature: 0-50 °C
Storage temperature: -20 - 70 °C
Relative humidity: 0 - 95 % (non-condensing environment)
Order code
Scope of delivery
Expert Opto Bridge 0404
Quick start guide
Description File name Version Date Size Changes to previous version/Comments
Manual anleitung_manual-eob0404.pdf 0.3 04/04/2019 339.73 KB

User manual (leaflet)

Product Brief gude-product-brief-eob0400-0404.pdf 04/04/2019 249.23 KB

Short product description

Declaration ce-erklaerung_eob0404_20-04-2016.pdf 20/04/2016 115.00 KB

CE declaration of conformity

USB Driver 2.12.06 01/12/2015 1.98 MB

Windows driver for 2000 (x32), Server 2003/2008 (x32/x64), XP (x32), Vista, 7/8/10 (x32/ x64)

• Release notes: Please refer to FTDI-Website