Many thanks for the helpful suggestions on and off-line. Given all the problems with Serial to USB adapters I am going to install serial PCI cards in my PC and then connect the correctly wired cable from the K2 (I understand it is not a true RS232 port on the K2) to a new serial port on the PC. I may do the same with my K3 rather than use the Elecradft Serial to USB cable, which actually works well. 73. Ron
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