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Parameters
The <ci> are photon counts in the range 0 to 16777215, one for each slitmask position
measured in the most recent R command.
Example
See section on the R command.
10. PMT
Reads a count using the PMT. This command requires configuration variables.
Syntax
PMT
Response
<count>
The count value (decimal number using ASCII characters) is right justified and padded
with spaces in a nine-character string.
Parameters
Parameter /
response
<count>
11. ** R
Measure the light intensity. This command requires configuration variables. The
configuration variable sets up the slit positions to correspond to a motor step position.
Syntax
R,<p1>,<p2>,<p3>
Parameters
<p1> may take values from 0 to 7, <p2> takes on values from <p1> to 7, and <p3>
takes on values from 1 to 255. In response the Brewer measures the light intensity for
each of the wavelength positions <p1> thru <p2> by running the slitmask from <p1> to
<p2> and back accumulating the counts for each separate position. This counts are
accumulated for <p3> repetitions of this back-and-forth scan. Every R command
zeroes the count accumulators for all slitmask positions. See the notes on the
configuration variable SLIT.PACE in section 5.19 Configuration Parameters.
If there are no parameters specified, the parameters from the previous R command
are used. If no previous R command parameters had been specified (as would be the
case after a warm start, for example) all of the parameters are assumed to be zero
and no scan is performed. In essence, all that happens is the count accumulators are
zeroed. The correspondence between <p1> or <p2> and slitmask position is given in
the following table:
Slitmask position
0
1
2
3
4
5
6
7
APPENDIX H COMPUTER / BREWER INTERFACE (TELETYPE)
format
24
0 to 2
-1
meaning
Hg calibration: 302.1 nm
Dark Count
λ1 306.2 nm
λ2 310.0 nm
λ3 313.5 nm
λ4 316.8 nm
λ5 320.0 nm
λ2 & λ4 for Deadtime test
MKIII OPERATOR'S MANUAL
meaning
the PMT count taken
117
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