GBS Elektronik MCA-527 Firmware Commands - Manual (Page 45)

Description of the MCA527 Firmware Commands
Name CMD_QUERY_EXTENSION_RS232_RX
Compatibility New MCA527 command.
Execution right Conditionally necessary (see remarks)
Description The command returns the last 1024 bytes received by the RS232 interface of the extension port .
b: Buffer control: 0 = current data
1 = buffered data
2 = buffered data, unlock buffer
3 = buffered data, lock buffer
Format integer integer integer long integer
Parameter Preamble command b 0 end flag
Byte string (HEX) A5 5A 25 01 b
l
b
h
00 00 00 00 B9 9B
Result data array
Byte offset 0 Number of bytes received since the last RS232 data transmission.
Byte offset 2 Data 1024 bytes
Byte offset 1026 Command flag and parameters 8 bytes
Byte offset 1034 Checksum unsigned short
Remarks If the MCA527 measures in repeat mode, the execution right is necessary.
The capability to lock and unlock the buffer is relevant if the MCA527 measures in repeat mode. It is
also used with the commands CMD_QUERY_SPECTRA and CMD_QUERY_SPECTRA_EX.
Locking the buffer makes sure that the buffer is not overwritten with the data of the next measuring
cycle before the buffer is not unlocked again.
If the MCA527 measures in a repeat mode which writes to the microSD memory card, the access to
the buffer is denied. In this case the buffer is exclusively controlled by the MCA527.
Name CMD_QUERY_HISTOGRAM
Compatibility New MCA527 command.
Execution right Not necessary
Description The command causes the MCA to acquire a histogram from 500.000 ADC samples (= 50 ms).
s:
start (0 ... 16384 – 256 * class interval width)
c: class interval width (1, 2, 4 ... 64)
The command is ignored and responds with an error value if a measurement is still running.
Format integer integer integer integer integer integer
Parameter Preamble command s c 0 end flag
Byte string (HEX) A5 5A 09 01 s
l
s
h
c 00 00 00 B9 9B
Result data array
Byte offset 0 Sample counts within the 256 class intervals unsigned long [256]
Byte offset 1024 Command flag and parameters 8 bytes
Byte offset 1032 Checksum unsigned short
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