You can run multi images, I recommend a product called edgeport. Its a professional USB to RS232 unit. They come in 2/4/8 port versions.
There on eBay all the time
http://cgi.ebay.com/Digi-Inside-Out-Edg ... 240%3A1318The only thing on the PC that is needed is that every running copy of SG-View needs to be run in its own folder as the .ini settings are keep there. I have reports of folks monitoring 7 units with 7 running images without issue
On the temperature, first I heard of that ... does selecting C or F in the setting make any difference?