One day I needed a device that could connect to a remote server and send bytes.
Of course, you can use a computer for these purposes, but it is cumbersome and inconvenient, and the reliability of such a system leaves much to be desired – too complex a device. Another microcontroller, such as the Microchip PIC, MSC-51 or Atmel AVR, is simple, reliable, consumes minimal power and is able to reliably perform a narrow range of tasks. For example, monitoring signaling over the Internet or Ethernet network. Everything would be fine, but then there is another problem – the TCP/IP protocol. Implementing on an AVR or PIC TCP/IP protocol stack is a doable task, but it takes time, and time is known to be money. It was necessary urgently and with minimal hemorrhoids. And that’s where the Ethernet interface module, RS232, came to my rescue. The task is standard, so there are plenty of offers on the market of ready-made modules, but do not rush. There are a number of subtleties associated with the peculiarities of these devices. For example, the vast majority of modules can work exclusively as a server that requires a dedicated IP address. The client device works only with specialized software, usually under Windows, and opens a virtual COM port that connects to a remote system (UART – Ethernet module) and provides data exchange. Not the most convenient option. For my task, this design was completely unsuitable. So I started looking further, soon the remarkable EG-SR-7100 module was discovered, and then its newer modification WIZ100SR. I read the characteristics – it! Everything to solve my problem!
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