MICRO-EPSILON confocal DT2471, Operating Instructions Manual

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Page 112
Appendix |ASCII Communication with Controller
confocalDT 24x1
are transmitted.
A 5.6.6 Time Stamp
Intrasystem the resolution of time stamp is 1 μs. For the Ethernet transfer a 32 bit data
word (unsigned integer) with the intrasystem resolution is output.
During transmission via RS422 only the bits 25 up to 8 of the time stamp are provided in
a 18 bit data word. It follows a resolution of 0.25 ms, an overflow is effected after approxi-
mately 65 seconds.
A 5.6.7 Measurement Data (Displacements and Intensities)
An intensity (if selected) and a measurement value are transmitted for each selected
displacement. For the Ethernet transmission 32 bit for each are used. The assembly of
the data word for the intensity is shown in the following table, see Fig. 81 . The resolution
of the displacement values is 1 nm on the Ethernet line, the output is signed. The format
for RS422 is described, see Chap. A 5.7.1 .
Bit position Description
0 - 10 Intensity of peak (100 % comply with 1024)
11 - 15 Reserved
16 - 29 Maximum of peak (from dark corrected signal)
30 - 31 Reserved
Fig. 81 Table Intensity
During transmission via RS422 only the ‚Intensity of peak‘ is transmitted (the lower
10 bit).
The intensity value is determined using the following calculation rule:
= Intensity
Max_dark
Saturation - M Max_dark
- Max_dark refers to the dark corrected signal.
- Max_raw refers to the raw signal.
- Saturation refers to the AD range (2^14-1).
A 5.6.8 Trigger Time Difference
The trigger time difference is output via Ethernet as an unsigned 32 bit integer or via
RS422 as an unsigned 18 bit integer with a resolution of 100 ns.