I don't have THS720A. Came across a RJ45 carries RS232 signals but could not find my records, I will search further n inform you when I found it. Actually there are not many lines to figure out, try it. Ask Tektronix already? Ling SM >I apologise for this off topic mail but I am desperate. >THS720A but have lost the RS232 cable :-( It is an RJ45 to PC serial port cable. I have tried the Tektronix web site and done various searches to no avail.