Your ultimate goal is to create a binary upgrade file so your slingbox can control your cable box.
So you need a way to examine the IR signals sent by your cable box remote.
Once you have the details about the IR signals that control your cable box, you'll be using RemoteMaster to create the binary upgrade file. You will not be using KM.
There are a few different ways to examine the IR signals generated by your remote
- Use a JP1 remote to capture (learn) the IR signals from your cable box remote, connect the JP1 remote with a JP1 cable to your PC and examine the learned signals in IR.exe. This requires you to buy a JP1 remote and a JP1 cable
- Use an IR Widget connected to your PC to capture the IR signals from your cable box remote. This requires you to buy an IR Widget.
- Build a CaptureIR compatible cable to connect to your PC and capture the IR signals from your cable box remote. This requires you to buy the parts and build the CaptureIR compatible cable.
Option 1 is the most expensive, but if you would also like a good inexpensive universal remote it is a good choice.
Options 2 is probably the best choice for the non-technical person who doesn't need or want a good inexpensive universal remote.
Option 3 is the least expensive, but requires some technical skill to buy and build the CaptureIR compatible cable, and (I think) will only work with a parallel port.
I hope this helps.