To be more clear for item 3): > ...Atlas bus line A4 is used to send the ADC overload status only > (no Mercury firmware version is reported to PowerSDR in v6.3). should say: "...Atlas bus line A4 is used to send the ADC overload status for Mercury 2 only (no Mercury 2 firmware version is reported to PowerSDR in v6.3)." Joe K5SO 1300145598.0