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.
The LTC100 converter lets your customer 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. Your customers do not need to change their PC's hardware or software.
The LTC100 lets your customer 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.
I think that in manufacturing industry; there are numerous legacy industrial machines with RS232 serial port. But, RS232 has some shortcomings. In most of the cases, they need more communication length, more transmission speed, and so on. In those cases, the LTC100 would be an ideal solution, which converts them to RS422 or RS485.

More information:
For detailed information see LTC100 Specs
|