I have attached two different schematics of circuits that I thought would be capable of protecting RS232 signals. The second one (RS232_Protect_2) I feel is all I would need to protect the RS232 chip from any mayhem that may occur on the actual device side. But, someone referred me to the first one (RS232_Protect_1) and I honestly don't understand it all. Would anyone be willing to give me an explanation as to why the first one may be better than the second and also perhaps an explanation as to how it works. Thank you.