TeBlues,
Thank you for contacting National Instruments.
Some great starting points getting familiar with Serial Communication is to reference the following KnowledgeBase articles:
Serial Communication Starting Point and
Serial Communication Overview. These give you a general overview, examples, and troubleshooting steps.
For specifics on how to communicate with the PRTemp1000, after going to the
Main Product Page for the product, it directed to an
accessory IFC110 that provides software, manual and RS232 computer interface cable for this specific device. I would recommend referencing this for the specific commands you would need to use.
Hope this is able to get you started. Have a great day.
Sarah S.
Applications Engineering
National Instruments