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I'm using old PDS DOS software to do some developmental changes and when I tried to download the new changes to the Panelview 1200 it says that it is transfering then after awhile it will give me a "PLC Communication Lost" error. I've checked baud rates and they work because I was able to download a smaller sized 1 screen Panelview program but when I tried to download the larger size (does not exceed max memory) it has that "PC Communication Lost" error and I have no idea why and can't get any programs loaded to the panelview... any suggestions??? Rack assignments are left the same as previous so this is not an issue, not a cable problem since I was able to download a smaller type program, PLC was put in RUN mode so this is not the issue, terminating resistor is installed on PLC so this is not it... I'm out of ideas!