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USB ↔ RS485/422 Quasi Opto Converters



  • USB 2 compliant (full-speed (12 Mbps)).
  • AUTO direction for RS485 (hardware, baud rate independent).
  • Interface Connector: DB-9, Male (default mode RS485).
  • Optional USB 5 V available on external pin.
  • Internal load termination (enabled on connector).
  • Data format supported: 8, 7, 6 and 5-bit.
  • Stop bits: 1, 1.5 and 2.
  • Standard baud rates available: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800 and 921600.
  • On board FIFO: 576 bytes receive and 640 bytes transmit available.
  • USB powered.
  • Default transmitter/receiver driver is 3.3 volt, however it is capable of functioning on 5 volt networks.
  • Serial number specifies a unique ID number that allows multiple units to be used on the same platform, thus registering N comports on the same host.
  • Can be used on a USB hub to extend the number of serial links on the host.
  • Transmit and receive activity is shown on LED's.
  • Receiver is optically isolated, hence quasi opto isolated. Connect Two units for total isolation.
  • Protection on both transmit and receive channels.
  • User configurable (422/485 mode) with link on connector.
  • Pin definition on hardware label.

Special features available on request:

  • Custom user Baud rates.

Virtual COM Port drivers:

  • Works with standard terminal programs (eg. Hyper Terminal).
  • Drivers available for Windows 2000/XP, Mac OS-9, Mac OS-X.
  • Drivers available for Linux 2.4, Linux ≥ 2.6.18 internal kernel driver.
  • Special programs, dll's or libraries can be custom made for Linux and XP.
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  • Linux test program available (2.6.18) (QT source).
  • Sniffer cables available (Manufactured on request).

DB-9 pin outs (Compatible with normal RS422/RS485 converters, direct replacement)

  • 1. B-RS485 or TXB-RS422.
  • 2. A-RS485 or TXA-RS422.
  • 3. RXA-RS422.
  • 4. GND.
  • 5. GND.
  • 6. RXB-RS422.
  • 7. RS485 Termination (220 Ω), if required connect to pin 2.
  • 8. Select RS422, default (RS485) open, for RS422 operation connect to pin 4.
  • 9. RS422 Receive termination (220 Ω),if required connect to pin 6.
  • Please note that no pre-bias is supplied on the unit.
  • If required the user can populated his own termination and or bias inside the DB-9 shell.

Hardware Notes

  • No pre-programming, build in hardware handshake, this version operate with hardware handshake enabled (National Instruments requirement).
  • Direct replacement for the historically RS422/RS485 Converter.

Order Information Product Number:

  • 5999-USB-422/485-OPTO

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Immediate email quotes is send to registered users, if available.
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Warranty : 1 year limited hardware warranty
Note: Specifications may change without notice

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