Advantech's ADAM-4520/4520I converter uses RS-422 and RS-485 on systems originally equipped with RS-232. RS-232 has limited transmission speed, range, and networking capabilities, RS-422 and RS-485 standards overcome these limitations by using differential voltage lines for data and control signals. The ADAM-4520I has the added features of wide power input and wide operating temperature range.
The ADAM-4520/4520I turns RS-232 signals into isolated RS-422 or RS-485 signals allowing 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.