How to handle the establishment and closure of network connection for RS232 communication
RS232 communication refers to the use of serial communication technology to transmit data between two computers, and in the development of modern network communication technology today, RS232 communication has become an old communication method. However, it is still widely used in some occasions with lower demand and shorter transmission distance, such as industrial automation control, medical equipment monitoring and other fields.
When using RS232 communication for data transmission, the establishment and closure of network connection is a necessary operation. The following will describe how to realize the establishment and closure of the network connection using RS232, and explain the role and precautions of each step.
1. Establishing a network connection
First, you need to set the communication parameters of the serial port, including the baud rate, number of data bits, parity, etc., so that the two computers have the same serial port parameters. Then establish a connection between the client and the server. Usually, in RS232 communication, after the client sends a connection request to the server, the server will confirm the connection request. After the server establishes the connection, it can transmit data with the client. At this point, you can send and receive data.
It should be noted that the establishment of a network connection must first ensure that the two computers are correctly connected, otherwise communication is not possible. In RS232 communication, connect the positive pole needs to be connected to the positive pole, the negative pole needs to be connected to the negative pole. At the same time, the communication must use one-to-one unidirectional communication, that is, one end is set up as the transmitter (TX), the other end is set up as the receiver (RX).
2. Closing the network connection
In RS232 communication, closing the network connection means interrupting the data transmission and ending the communication. When it is necessary to close the network connection, the client first sends a closure request to the server, and after the server confirms the request, the connection can be interrupted. Before closing the connection, you need to make sure that all data transmission has been completed, to avoid the loss of data due to the interruption of the network connection, and note that when closing the connection, you need to close the serial ports used at both ends.
Summary
The above is how to deal with RS232 communication when the network connection is established and closed. In practice, the need to select the appropriate communication method according to the specific circumstances, and select the appropriate communication protocol. At the same time, for network connection establishment and closure, pay attention to the correct setting of communication parameters, keep the two computers correctly connected, and only after the completion of data transmission to interrupt the connection.