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This article mainly introduces how to solve the problem of VB.NET serial communication, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

VB.NET serial communication support always makes people feel inadequate, when using VB6's MsComm32.ocx, many people will feel very troubled in the development of VB.NET. The VB.NET serial communication class described here uses native code, and it is implemented through API calls, you will find that VB.NET serial communication is so simple.

Before explaining how to use this class, it is important to note that this class is only a demonstration of VB.NET serial communication, and you may need to modify it according to your situation. In addition, the purpose of this class is to teach you through examples to develop serial communication programs with VB.NET without the support of ocx controls and third-party components, all without perfect exception error handling.

1. Initialize and open the serial port

Create an instance of the CRs232 class and set the serial communication parameters before calling the Open method.

Dim moRS232 as New Rs232 () With moRs232 .port = 1'//Uses COM1 .BaudRate = 2400'/ / baud rate 2400 .DataBit = 8'/ / 8 data bits .StopBit = Rs232.DataStopBit.StopBit_1'/ / stop bit 1.Parity = Rs232.DataParity.Parity_None'/ / No parity. Timeout = 500'/ timeout 500 ms End With'/ initialize and open the serial port moRS232.Open ()'/ / after the serial port is opened You can control DTR/RTS moRS232.Dtr = True moRS232.Rts = True at will.

two。 Send data

This class has prepared two buffers (buffer) for Rx and Tx. When sending data, just set the TxData property to the data you need to send, and then call the Tx method.

MoRS232.TxData = txtTx.Text moRS232.Tx ()

3. Receive data

First call the Rx method (the argument is the number of bytes you need to read from the serial port), and then read the RxData property.

MoRS232.Rx (10)'/ / reads 10 bytes of Dim sRead as String=moRs232.RxData from the serial communication buffer

It should be noted that when the class cannot read the required number of bytes through the serial port, the program thread is locked before the timeout exception occurs, and the timeout is set by the Timout property.

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