Hi Sandeep,
I don't know your controller, but I know it won't work, if you use the
old serial vis, because they do not handle the serial buffer correctly
and you have dataloss.
I always use VISA Configure Serial Port, VISA Set I/O Buffer Size with
write and read buffer set to 8kB.
To discover behaveure of connected, unknown serial instruments, ist
helpful to DISABLE termination character at VISA Configure Serial Port
and display the states of important serial lines, like CTS, DCD, DSR,
DTR, RI and RTS. For this insert a proprty Node in the wired VISA
resource name. You find the property node in Functions/Instrument
I-O/VISA/VISA advanced in the diagram context menu.
If you open all required COM ports in this manner, LabVIEW and the
operating system will put
all received data in the 8k- buffers of each
port (until buffer- overrun occurs).
All you have to if all ports are opened, is to cyclicly check all
buffers contents using a property node like above with the property
"Bytes at Port" and read out data with VISA read.
Prevent buffer overruns!! For instance, if you use 115200 Bd and you
want to have double security, buffers have to be emptied, when they are
filled with 4kB max. With 8N1, 1Byte uses 10 Bits in transmission, so
there will be 11520 Byte transmitted per second at max. So you better
have all buffers emptied after 356 ms.
I hope this helps,
Rainer
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