Why Isn't My .NET SerialPort Receiving Data?

Resolving .NET SerialPort Data Reception Problems

This guide addresses common issues encountered when a .NET SerialPort application fails to receive data from a COM port.

The Issue:

A .NET console application, despite registering a DataReceived event handler, doesn't trigger the event when data arrives via a COM port.

The Solution:

The root cause often lies in an incorrect handshake configuration. Many serial devices depend on handshaking (DTR and RTS signals) for proper communication. Setting the handshake property appropriately usually resolves the problem:

ComPort.Handshake = Handshake.RequestToSend;

Further Troubleshooting:

If the problem persists, verify the following:

• Connection: Ensure the physical connection between your system and the serial device is secure.
• Communication Parameters: Double-check baud rate, parity, data bits, and stop bits match the device's settings.
• Device Responsiveness: Use a separate serial communication tool (like PuTTY or HyperTerminal) to confirm the device is transmitting data correctly. SysInternals' PortMon can provide detailed driver interaction logs for advanced analysis.

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