I would also to thank everyone and GIT for the help.There is just one thing, I cant get my laptop to talk to the slc 150. I have checked everything (I Think ) to be sure that it is not my laptop or settings for the serial port. My hand held programmer works with the plc and I have swaped cables as much as possible but still no luck. The asssembly of cable came with the slc in a cnc mill of the 1990 vintage. the cable is interface converter 1745-pcc and I assume that the cable adapter from a db 25 to db 9 cable is a factory item. I suspect this assembly is the problem. Thanks Mike'shop.