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IRS422: Opto/Xformer Isolated Async RS232 to RS422 converter


IRS422 with Box

IRS422 Label

"Let me spin a very large
RS485 network for you!"

  • Isolated interface converter for RS232 to RS422 (4-wire, full-duplex) point-to-point communications, at distances up to 4000 ft. and data rates up to 115.2Kbps.

  • Galvanic (Opto/Xformer) Isolation helps eliminate noise, and protects equipment from destructive transients found in industrial applications.

General Description:

The IRS422 is an Async bi-directional RS232 to RS422 interface converter for 4-wire RS485/RS422 applications (full-duplex point-to-point). The unit has fixed light bias on the RS485/RS422 receiver, jumper selectable termination, and RS232 DTE/DCE selection. The unit has 3 LED indicators, screw terminals, and an onboard switching regulator. The unit will operate at speeds up to 115.2Kbps.

The IRS422 is designed for office and/or isolated industrial applications, and is used for 4-wire full-duplex, point-to-point applications (remote sign control, RS232 "extension core"). The IRS422 can be used in outdoor applications; however, many factors can affect reliable operations. Please call for additional information and/or peruse our Fiber Optic product line (compatible with our "copper" converters).

Need something special? Please contact us. We have additional isolated and non-isolated converters, repeaters, and repeater hubs. Units are generally stock to 2-3 business days for shipment. We design and manufacturer our entire product line, and offer technical support for our units, and can offer system recommendations for your application. Please give us a call: 513-874-4796

Related Files:

pdf icon IRS422revB.pdf Converter schematic/physical Rev. B

Physical Properties and Features:

RS232 3-wire interface to screw terminal connector (TX, RX, Common)
RS422/485 Screw terminals (Common, RX+, RX-, TX+, TX-, C/+)
Power Screw terminals
LEDs Power(YEL), TX-RS422(RED), RX-RS422(GRN)
Bias Fixed light bias on RS422/RS485 Receiver
Termination 120 Ohm (jumper selectable)
Special Switching regulator for 9-35VDC operation
Protection 1500VDC, 1 sec. Galvanic isolation


Distance RS485/RS422 up to 4000 ft. (1250 meters)
Operation 4-wire, full-duplex RS485/RS422
Format Asynchronous data with any combination of bits, parity, stop
Speed Up to 115.2Kbps (and above, call us)
Temperature 0-65C (32-150F) ambient
Humidity 10-90% non-condensing
Voltage 9-35VDC
Power Under 3/4 Watt (typical) + external load
Size 3.50" X 2.75" X 0.9" (PC Board), with connectors: 3.50" X 3.00"
Mounting 4-Holes 3.00" X 2.25" (built-in standoffs for #6 hardware)

Options and Ordering Information:

IRS422 $99.00 ea. (Circuit board only)
Enclosure $10.00 ea. (Medium)
Cable None available (screw terminal connections only)
Supply $8.50 ea. (12VDC @ 200/300 mA wall power supply)

*IRS422 with all options (Enclosure/PS): IRS422-BSPS @ $117.50 ea. (Qty. 1-9)

Need a different configuration or more information? Give Ron a Call at 513-874-4796 or 513-638-0228(Cell)

Webstore: IRS422

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