Network Legacy serial communication protocols such as Modbus have merged rapidly with modern TCP/IP communications, yielding benefits such as widely available infrastructures and greater distance, reliability, and speed. A suitable Serial-TCP program offers ideal solutions to bridge your existing Serial/COM port and TCP/IP without the need for changing protocol.
It works seamlessly and transparently, just like a pair of passive repeaters; furthermore, instead of requiring installation of cables and converters with limited distance, it simply makes use of existing computers and networks with an unlimited transmission distance. Because of the long distances and the surrounding electrical devices/equipment, RS-485 / RS-422 networks are often exposed to electrical noises, remote lightning, and line surges, which can cause transient voltage to run across the serial communication system and the valuable equipment.