"God only helps those who help themselves"
There are all kinds of SLCs. Do you have REALLY have a SLC 500 (solid brick - really old) or do you more likely have a SLC 5/02, 5/03, 5/04 or 5/05?
What kind of RS232 cable do you have? Straight through, Null modem, one you made, one from AB, etc.
You need to be MUCH more specific in your details and you REALLY need to put forth a little effort and do a search here as this question has been covered dozens of times.