Hi all,
I want to make a VI to read temperature data packages from a serial port. The data is sent from a monitor automatically in a fixed period, so the VI is only required to read data from the serial port.
I have made a VI, which can show the number of bytes at serial port and read all the data once a button is pressed. The problem is that the number of bytes at serial port is always zero no matter how long I have wait before reading. Consequently, no data is read.
Could anyone help me? Thanks a lot!
More information:
1. This VI can work properly when I send data from a virtual serial port created by VSPD software.
2. The serial port seems right in Windows Device Manager. What's more, other software can read data successfully (but I need to process data in LabVIEW).
3. NI-VISA is installed and serial port is configured properly. No error occurs during operation except no data received.
4. My PC is connecting to the monitor via a standard RS-232 interface directly, and no USB-to-RS232 adapter is used.
5. I have study the signal by an oscilloscope and find it is right. (Other software's working properly can also demonstrate this.)
