18
ADC Data Format
The ADC counts are transmitted in two-byte format. The two most significant bits (MSBs) of Data Byte 1 are
always both set to 1 and bits seven and six are set to 1 and 0, respectively.
Data Byte One
Data Byte Two
The six least significant bits (LSBs) of Data Byte One represent the six MSBs of the ADC counts. The six LSBs of
Data Byte Two represent the six LSBs of the ADC counts. Valid combined readings are from 0000 to 4096
(12 binary bits). However, the EM500 contains a 12-bit ADC with headroom and footroom yielding typical
full-scale readings from 1500 to 2500 representing 2000 counts on the display. Also, the EM500 does not trigger
on pulses less than 5% of full scale. Therefore, the minimum raw ADC readings are about 75 counts.
Note:
See the
Query Full Scale Reading
Remote Command for instructions on computing Joules or Volts from
raw ADC readings.
Summary of Contents for ENERGY MAX EM400
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