I don't have an LabVIEW version here at home, only at my work so I can not test it...
but I have used it at my work, and I think you just have to set up an serial connection, serial write, serial read... serial settings stuff...
I don't think there is much difficult on this. I have used it in a project where we communicate with home made blackboxes over RS-232 there was no problem at all...
maybe you can download a driver for a scoop and see how that connection is set up on the national instruments website
I have not tested it and I am not in front of PC with LabVIEW but RS-232 with LabView should be a breeze I think. LabVIEW is designed for all kinds of communications.
All functions -> Instrument I/O -> Serial
There are the following vis:
VISA Configure
VISA Write
VISA Read
VISA Close
Just use them for programming your application.
If you want you can use Instrument I/O Assistant instead.
Here i've got a little example, regrettably written in 6.1. The left part is
the configuration of the serial port followed by the reading function.
The other parts computing speed from a slot-car.
Remind that the serial read vi returns a string variable, that you perhaps
have to convert to a integer or double value.
"Visa Configure Serial Port", to initialize a serial port.
The property node "Bytes at Port", to know the number of bytes currently available at the serial port.
"Visa Read", to read a specified number of bytes from the serial port.
"Visa Write", to write a string to to the serial port, and
"Visa Close", to close a device session, when you don´t need the serial port.