MICRO-EPSILON confocal DT2471, Руководство по эксплуатации

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Page 114
Appendix |ASCII Communication with Controller
confocalDT 24x1
A 5.6.10 Differences (Thicknesses)
Calculated differences between two displacements have the same format as the dis-
placements.
At first, the selected differences between the displacement 1 and the other displace-
ments are output, then these of displacement 2,...
The differences are displayed as 32 bit signed integer value with a resolution of 1 nm.
The RS422 format is documented, see Chap. A 5.7.1
A 5.6.11 Statistic Values
The statistic values have the same format as the displacements.
At first minimum, then maximum and at the end peak to peak is transmitted (if selected).
The statistic values are displayed as 32 bit signed integer value with a resolution of 1 nm
respectively in format for the RS422 interface.
A 5.7 Measurement Data Format
A 5.7.1 Data Format RS422 Interface
The output of displacement measurement values, differences between measurement
values and statistic values via RS422 need a subsequent conversion in mm. Other values
as exposure time, time stamp, profile counter, encoder, intensities or status data are
transmitted as 18 bit data words, a conversion is not required.
Measurement value 1:
Preamble Data bits
L-byte 0 0 D5 D4 D3 D2 D1 D0
M-byte 0 1 D11 D10 D9 D8 D7 D6
H-byte 1 0 D17 D16 D15 D14 D13 D12
Measurement value 2 ... 32:
Preamble Data bits
L-byte 0 0 D5 D4 D3 D2 D1 D0
M-byte 0 1 D11 D10 D9 D8 D7 D6
H-byte 1 1 D17 D16 D15 D14 D13 D12
Value range for the displacement and thickness measurement:
2 MR
Thickness
Displacement
0
0
MR
Error
98232 131000
163768 229304 262072
2 16 = 65536
0
131000 = Midrange for the displacement measurement
MR = Measuring range
The linearized measurement values can be converted in millimeters using the subse-
quent formula:
=
x
(d
OUT
- 98232) * MR
65536
x = Displacement / Thickness in mm
d
OUT
= digital output value
MR = Measuring range in mm