TDC data output format:
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EventID; ChannelID; Time (counts/ns); Width (counts/ns)
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Negative values in channelID give special meaning to following data:
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EventID; -1; TDC-128_Extended_Trigger_Time_Tag (counts/ns); 0
EventID; -2; TDC-64_Extended_Trigger_Time_Tag (counts/ns); 0

EventID; -100; GPS_year; 0
EventID; -101; GPS_day; 0
EventID; -102; GPS_second; 0
EventID; -103; GPS_nanosecond; 0
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