Cmd_query_extension_rs232_rx, Cmd_query_histogram – GBS Elektronik MCA-527 Firmware Commands User 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
45