Isolated RS-232 to RS-422/485 Converter



  • Automatic RS-485 data flow control
  • 3000 VDC isolation protection
  • Surge protection RS-485 data line
  • Transmission speed up to 115.2 Kbps
  • Networking up to 1200 meters (4000 feet)
  • Reserved space for termination resistors
  • Power and data flow indicator for troubleshooting
  • Power requirement: +10 to +30 VDC
  • Mounts easily on a DIN-rail, panel or piggyback



LED Indicators Comm
Mounting Panel
Power 10-30VDC
Temperature -10 to 70C
Temperature (Operating) -10 ~ 70° C (14 ~ 158° F)
Humidity 5 ~ 95% RH
Isolation 3kV
Temperature (Storage) -25 ~ 85° C (-13 ~ 185° F)
Interface RS-232 to RS-422/485
Isolation Protection 3,000 VDC
Communication Speed Serial: From 1,200 to 115.2 k
Comm. Distance RS-422/485: 1.2 km RS-232: 15 m
Data Flow Control Yes
Connector RS-232: female DB9
RS-422/485: plug-in screw terminal
Power Supply
Power Requirement 10~30 VDC


Most industrial computer systems come with standard RS-232 serial ports. Though widely accepted, RS-232 has limited transmission speed, range, and networking capabilities. The RS-422 and RS-485 standards overcome these limitations by using differential voltage lines for data and control signals.

AD-ADAM-4520/4522 converter lets you take advantage of RS-422 and RS-485 on systems originally equipped with RS-232. It transparently converts RS-232 signals into isolated RS-422 or RS-485 signals. You do not need to change your PC's hardware or your software. AD-ADAM-4520 lets you easily build an industrial grade, long distance communication system with standard PC hardware. It extends the communication distance by 4000 ft. (1200 m) or increases the maximum number of connected nodes by 32.