The use of microcontroller virtual serial port in Proteus

The use of virtual serial ports in Proteus should be more accurately called "the use of serial ports in Proteus", but we use software to realize simulation, and virtual serial ports are used more frequently here.

First, set up the environment in Proteus. It is very simple. You only need two components to connect VIRTUAL TERMINAL and COMPIM. As shown in the figure, TXD of VIRTUAL TERMINAL is connected to TXD of COMPIM, and RXD is connected to RXD. The following figure analyzes why they are connected like this:

VIRTUAL TERMINAL is a serial port monitoring instrument, which can be used to capture and display the waveform that complies with the RS232 protocol on the data line, and can also send the waveform of the RS232 protocol to the data line; COMPIM is a serial port component, which can be set to occupy which serial port on the computer, which can be an "actual serial port" or a "virtual serial port". For Proteus, it is impossible to distinguish between a virtual serial port and an actual serial port. The next step is to set the communication rate and communication format. Just set the same in the property box. In this way, data communication can be achieved. The picture shows my settings of VIRTUAL TERMINAL and COMPIM:

The next step is to realize the communication between Proteus and the serial debugging assistant. In VIRTUAL TERMINAL, you can directly input the data you want to send on the keyboard, but there is no display in the interface. You can see the corresponding input data through the serial debugging assistant.

In this way, data is transmitted from Proteus to the serial port debugging assistant, and the corresponding data flow relationship is as follows:

Now you know why in Proteus the TXD of VIRTUAL TERMINAL is connected to the TXD of COMPIM, and the RXD is connected to the RXD.