If you know it's RS232, why not send into a PC?
Richard has confirmed it's not RS-232.
definitely not rs232
if you can't identify the device then a complete transaction from line idle to send/receive and back to idle with a data translation would help . guessing seems pointless
I can identify everything.

I don't really need to convert the data into a "readable" format, all I need to do is accurately measure the on/off period in each bit. For example, if I'm able to do something like this, my job is complete:

Bit 1 // On - 100uS / Off - 400uS
Bit 2 // On - 350uS / Off - 150uS
Bit 3 // On - 100uS / Off - 400uS
Bit 100..........

I'm using an 18F87J50 and tried using an ECCP input but was never able to get it working. Then I figured if it was some type of standard communication I'd be able to push the easy button but that's not a reality now.