When I have a failed or suspected bad HI 2151/30WC, I swap out the unit to help isolate the problem. I do this by installing the current SMM into the replacement HI 2151/30WC. Then all the configuration and calibration information is supposed to be transferred. This should make for a fast and efficient transfer, but the problem is I am getting an ERREXC error displayed. Why do I get an ERREXC when swapping SMM?