Description of the MCA527 Firmware Commands
Name CMD_QUERY_AHRC_HISTOGRAM
Compatibility New MCA527 command (since firmware version 13.08).
Execution right Necessary
Description The command causes the MCA to acquire a histogram from the areas of all detected events within
an acquisition time of 0.8 seconds. The area is equivalent to the sum of the differences between the
ADC value and the baseline from the point where the signal curve exceeds the threshold to the point
where the signal curve falls below the threshold again.
c: class interval width (1, 2, 4 ... 32768)
The command is ignored and responds with an error value if the general mode is unequal to “Time
stamp recorder (AHRC = analog high rate counting)” (= 5) or if a measurement is still running.
Format integer integer integer integer integer integer
Parameter Preamble command c 0 0 end flag
Byte string (HEX) A5 5A 2B 01 c
l
c
h
00 00 00 00 B9 9B
Result data array
Byte offset 0 Results
unsigned long [360]
Byte offset 1440 Command flag and parameters 8 bytes
Byte offset 1448 Checksum unsigned short
Remarks The histogram is used to determine the AHRC group width. Before calling this command, the
command CMD_SET_AHRC_PARAM may need to be called to set the AHRC threshold. The same
command is subsequently used to set the new AHRC group width
Name
CMD_QUERY_DETECTOR_INFO
Compatibility New MCA527 command (since firmware version 14.03).
Execution right Not necessary
Description The command returns 1024 bytes of the detector information.
Range: 0: [0 … 1023]
1: [1024 … 2047]
Format integer integer integer long integer
Parameter Preamble command range 0 end flag
Byte string (HEX) A5 5A 33 01 range
l
range
h
00 00 00 00 B9 9B
Result data array
Byte offset 0
Data
1024 bytes
Byte offset 1024 Command flag and parameters 8 bytes
Byte offset 1032 Checksum unsigned short
Remarks There are detectors that supply detector information that are stored in an integrated EEPROM with a
maximum size of 2048 bytes. The structure of the detector information is described in an extra
document.
The flag FEATURES_DETECTOR_INFO_VALID of the parameter “MCA features” (byte offset 8)
returned by the command CMD_QUERY_STATE527 indicates if valid detector information are
available.
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