Can somebody help me ,I 'm new for AB PLC, I have PLC 5/15 ,I can not communicate to its,solftware used is rs-linx and PLC 5 , I think the problem from communication cable.I have limit budget can anybody help me about schematic of commu cable for programing program to PLC 5/15.I use notebook and usb converter to rs-232 for com port. Thank, Xing