kcarlen , I am well aware that it is not , but his post is far from conclusive that he knows what the port is - do you not think that it is better to warn him in this case that if he uses an ethernet cable "Will I be able to program both the PV550 and SLC 5/03 with the same cable?" to program , and one assumes from the post that he will use ethernet as he doesn't mention using a PIC or PCMK card , or acknowledge their existance .
The fact he asks about programming with the same cable leads me to believe that there may be some confusion , hence the advice , as equipment won't get damaged by too much checking etc . Perhaps you can advise how he will program the 550 and the 503 using the ethernet patch cable ? , I can't find anything that you could plug it in to , it won't fit in a PIC , it is no use for PCMK , I don't know about the new USB PIC , but I assume it comes complete with cable .
If you can use the ethernet patch cable for 550 to 503 , I assume this is the straight one , then for programming 503 , then this would be cross-over ?