How to Build an RS232 to RS485 Adapter

Written by bryan roberts
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RS232 and RS485 cables are both special types of serial cables that enable the connection of serial devices such as printers and scanners, to a device meant to receive the signal, such as a computer. If you have a device with a RS232 port that you need to connect to a RS485 port, you can easily construct a makeshift adaptor cable with the right equipment.

Skill level:

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Things you need

  • RS232 serial cable
  • RS485 serial cable
  • RS232-to-RS485 connector

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  1. 1

    Connect one end of your RS232 cable to the RS232 port on your connector.

  2. 2

    Connect one end of your RS485 cable to the RS585 port on your connector. The adaptor cable is now constructed.

  3. 3

    Connect your two incompatible devices by connecting the RS232 end of the cable to your RS232 device, and the RS485 end of the cable to your RS485 device.

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