1. Supposedly, you have a serial port device connected to your PC, you want to share your device over network and for this purpose you install Serial to Ethernet Connector. So, now all the client computers are able to connect and communicate with your device as if it is connected to those PCs. In this way, with the help of SEC you can turn your PC into a home server with multiple clients, with or without SEC installed in remote systems. Using raw data transmission protocol you are not able to manage signal lines and remote serial port, however, transmission speed is much higher, as you don't pass unnecessary traffic over network. This connection type is convenient when you only need to pass the data from/to your serial device.
RAW server <--> RAW multi clients
2. Let's imagine, you have a serial port device, connected to real serial port on your local PC and you want to operate this device using some application, which is installed on target PC. For that purpose, both computers have SEC installed, now after virtual serial port is created on target PC and an application there connects to it, you are able to communicate with remote serial device via local virtual serial port with this application directly. As we selected Telnet underlayer protocol your application will be able to manage all real serial port settings as if the device was connected directly to the remote PC.
Telnet client (real serial port) <--> Telnet server (virtual serial port)
3. You have two applications, which are installed on different PCs, but you are not able to connect these PCs directly using null-modem cable. But these PCs are connected to Internet or local network. So with the help of SEC you are able to create virtual serial ports on both PCs and thus connect one application to another via LAN or Internet and applications will communicate just the same as if they are connected directly using null-modem cable.
Telnet client (virtual) <--> Telnet server (virtual)
4. For instance, you have a device, which supports Telnet (RFC 2217) protocol over network and which is located far from your local PC but you want to work with it locally. For this purpose you install SEC on your local PC and now you are able to connect and communicate with this remote device directly as if it was connected locally.
Telnet client (virtual) <--> serial device
Notice: Single license for Serial to Ethernet Connector allows you to install this application on two computers.