[Introduction]：E810-DTU(RS232)-V2.0 is a RS232 to Ethernet single serial port server. Realize
data transparent transmission between RJ45 network port and RS485/RS232..
The module is equipped with a M0+ series of 32-bit processors, fast and efficient.
It has an adaptive network speed (up to 100M full duplex), and has four
communication mechanisms: TCP Server, TCP Client, UDP Server, and UDP Client.