RS-232 to RS485/422 Serial Converter

Convert an RS232 data signal to either RS485 or RS422

Product ID: IC485S

  • Supports up to 4000 ft cable length
  • Handy DCE/DTE mode selection switch
  • Supports point-to-point multidrop configuration
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  • Can be used to monitor RS-485/422 signals
  • Monitor mode allows read only
  • Full or half duplex operation
  • Durable plastic construction protects interior components
  • Draws power from connection or uses 9V power adapter (included)
  • 2-year warranty and FREE LIFETIME technical support
$65.99 CDN
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IC485S [IC485SIS] converts RS-232 serial interfaces to RS-485/422 serial interfaces for trouble-free data transmission. This 2-in-1 converter converts RS232C to either the RS-485 or RS-422 interface, and is DCE/DTE mode selectable at the flip of a switch, making it easy to change line signals!

The RS232 serial interface converter offers several convenient features including mode selection, point-to-point multidrop configuration and RS 485/422 monitor mode, and is constructed of high grade plastic for enhanced durability. The converter supports connections of up to 4000 ft, with data transfer rates of up to 1MB/sec.

Suitable for a broad range of operating environments, this adapter includes an optional 9V power adapter or can draw power on its own, and is backed by’s 2-year warranty and FREE lifetime tech support.

The Advantage

  • Can be used to monitor RS-485/422 signals
  • 2-in-1 converter! Converts RS232C to either RS-485 or RS-422 with cable length up to 4000 ft!
  • Supports point-to-point multidrop configuration and full or half duplex operation
  • 2-year warranty and FREE LIFETIME technical support


Converts RS232C signals to either RS-485 or RS-422 signals

Great for monitoring or controlling RS-422/485 devices like PLCs and other industrial equipment

Ideal in office, warehouse, or other environments where RS-232 and RS-485/422 are used

Technical Specifications

Warranty Information
Warranty 2 Years
Interface Serial
Port Style Cable Adapters
Ports 1
Max Baud Rate 115.2 Kbps
Maximum Cable Length 4000 ft [1219.5 m]
Maximum Data Transfer Rate 1MB/sec
Serial Protocol RS-422/485
Connector Type(s) 1 - DB-25 (25 pin, D-Sub) Female
1 - RJ-11 Female
1 - Terminal Block (4 Wire)
Center Tip Polarity Positive
Output Current 0.3A
Output Voltage 9 DC
Plug Type M
Power Consumption (In Watts) 2.7
Power Source AC Adapter Included
Humidity 0~80% RH
Operating Temperature 0°C to 50°C (32°F to 122°F)
Storage Temperature -20°C to 60°C (4°F to 140°F)
Physical Characteristics
Color Gray
Enclosure Type Plastic
Product Height 0.7 in [19 mm]
Product Length 2.7 in [68 mm]
Product Weight 1.7 oz [47 g]
Product Width 2.1 in [54 mm]
Packaging Information
Shipping (Package) Weight 0.9 lb [0.4 kg]
What's in the Box
Included in Package 1 - INTERFACE CONVERTER


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Product Support

Frequently Asked Questions


When you troubleshoot issues with a serial device, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • Serial cables

  • Serial ports

  • Serial devices

To test your setup components, try the following:

  • Use the serial cable, serial port, and serial device in another setup to see if the problem is with the components or the setup.

  • Use a different serial cable, serial port, and serial device in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test your cables, it is recommended that you do the following:

  • Test each cable individually.

  • Use short cables when you are testing.

When you test the serial ports and serial device, it is recommended that you do the following:

Note: Some serial devices work only if the COM port number is between a certain range. For example, COM1 to COM4.

To check whether or not an RS-232 serial port is working, perform an RS-232 loopback test by doing the following:

  1. If your serial port is not female, convert it by taking a female/female cable or gender changer and plugging it into the serial port.
  2. Take a metal paperclip or wire and cross pins 2 and 3. If you look closely at the female end, the pins should be numbered.
  3. Open a telnet session on the COM port number of the device that you are testing. To find out the COM port number, refer to the following FAQ:

Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. Windows XP comes with Hyper Terminal.

  1. When the session is open, anything you type into it you should see. The loopback test fails when you cannot see what you are typing.

If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port. 

You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session.  When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.

For products related to this article, click here.

RS-232 to RS485/422 Serial Converter

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