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PC Based Industrial Automation

Featured Product

This months featured product is the ADAM-4520 RS-232 to RS-485 converter.
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ADAM-4521 Addressable RS-232 to RS-422/RS-485 Converter Module

Download PDFDownload the ADAM-4521 data sheet.


ADAM-4521 ModuleThe ADAM-4521 is an intelligent RS-422/485 to RS-232 converter specifically designed to connect RS-232 devices to an RS-422/485 network. RS-232 is the most common transmission standard. Although widely available on most computer systems, measurement equipment, PLCs, and industrial devices, its transmission speed, communication distance, and especially networking capability are limited due to unbalanced transmission. The ADAM-4521 addressable converter solves this problem and lets you easily build up an RS-485 network with your RS-232 devices by assigning each one an address for easier communication.



  • Power Input Unregulated 10 - 30V DC.
  • Connectors
    1 x plug-in terminal block (#14 - 22AWG) for RS-422/485
    1 x DB9-F for RS-232
  • Power and data flow indicator for troubleshooting
  • Isolation Protection 1000VDC
  • Built-in micro-processor and watchdog timer
  • Automatic RS-485 flow control
  • RS-232 and RS-485 can be set to different Baud rates
  • Software configurable to either addressable or non-addressable mode
  • Surge protection RS-485 data line
  • Power Consumption 1.0W @ 24 VDC
  • Humidity 5 to 95% RH
  • Operating Temperature -10 to 70°C
  • Storage Temperature -25 to 85°C
  • Isolation Voltage 3000VDC
  • Mounts easily on a DIN-rail, panel or piggyback
  • Reserved space for termination resistors

Serial Communications

  • Input RS-232 (4-wire)
  • Output
    RS-485 (2 wire) or
    RS-422 (4 wire)
  • Baud Rates
    300, 600, 1200, 2400, 4800, 9600
    19.2k, 38.4k, 57.6k, 115.2k,
    RTS control and RS-422 (switchable)
  • Transmission Distance Up to 1200m (4000ft)
  • Automatic RS-485 Data Flow Control