Unihedron
SQM-LU Users manual
4.2 Response details
4.2.1 Reading request
The “Reading” request “
rx
” commands the SQM-LU to provide the current darkness value as well as
all variables used to generate that result.
The format of the response is:
Column Value
Description
0
r
Indicates that a reading is being returned.
2-8
06.70m
Reading in magnitudes per square arc second.
Leading space for positive value.
Leading negative sign (-) for negative value.
A reading of
0.00m
means that the light at the sensor has reached the
upper brightness limit of the unit.
10-21
0000022921Hz
Frequency of sensor in Hz.
23-33
0000000020c
Period of sensor in counts, counts occur at a rate of 460.8 kHz
(14.7456MHz/32).
35-46
0000000.000s
Period of sensor in seconds with millisecond resolution.
48-54
039.4C
Temperature measured at light sensor in degrees C.
Leading space for positive value.
Leading negative sign (-) for negative value.
55-56
Carriage return (0x0d), Line feed (0x0a).
Table 2: Reading request response
An example is:
r, 06.70m,0000022921Hz,0000000020c,0000000.000s, 039.4C
0123456789
10
123456789
20
123456789
30
123456789
40
123456789
50
123456
Future revisions of this reading string will only modify reported values beyond position 54. Characters
0 to 54 may be considered stable.
Revision 1.1
Page 8
Last modified: Jun 18, 2011
