So a null cable is usually for connecting two computers and a straight through is usually for connecting a computer to a device?

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The function of the device (DTE vs. DCE) and the wires connecting them was what I was referring to earlier, confusing you. Here is a decent explanation of the terms:

http://ckp.made-it.com/dtedce.html

Then, for this purpose, there really isn't a difference in functionality? (Unless of course, you wanted to use this same cable to connect your SCC to an actual device)

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The functionality of a null modem is to cross the send and receive lines of a serial connection. A DTE and DCE device will already communicate to each other on these send and receive lines (send-receive, receive-send). Two DTEs will have send hooked to send, and receive hooked to receive - which won't work. Which is why a null modem is needed in between, crossing those lines. With the SSC, you can physically choose which way the lines go.