While I'm not familiar with Solartron Digital Probes, I am guessing (based on the forum) that it has a serial interface. In that case, you will simply need to obtain the serial configuration (baudrate, data bits, handshaking, etc.) and a list of the device command strings, and then create a LV app that initializes a com port on your PC, creates and transmits the appropriate string(s) and then reads the results from the device. There are several examples in LV to help you out, but if you have any specific questions, feel free to post them!