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6
Output Signals and Supply
2-axis SIRIUS II position indicator
6.3
DIGITAL Interface Module (Digital Signal TTL)
20
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6.2.6
Using the analog interface module with the 2-axis SIRIUS II position
indicator (for technical information, see chapter 12 in the MINI-X
product catalogue).
Storage temperature of the position indicator:
-40 °C to + 70 °C
Operating temperature of the position indicator:
0 °C to 45 °C in relative humidity between 15% and 95% without condensation.
The maximum input frequency is 100 kHz which guarantees a speed of 5 m/s. The
built-in interpolation factor for an analog input of the position indicator is 20. This
achieves a resolution of just 5 µm. We therefore recommend using the SIRIUS II
position indicator with the digital input option, along with the MINISCALE PLUS
digital interface module.
6.3.1
Output Format:
Differentially interpolated digital signals with reference pulse (A, B, R)
TTL signal, 5 volt level (RS422)
The digital interface module both processes the raw signals and interpolates the
processed analog signals. The interpolation achieves a resolution of 100 nm.
The digital signal waveform consists of an A and a B signal. The spacing between
the two edges of signals A and B corresponds exactly to a distance of 100 nm.
Accordingly, the scale increment of 100 μm on the incremental track of the
dimensional scale is divided into 1000 sections of 100 nm by means of interpola-
tion.
The A signal either lags behind the B signal or occurs before it, depending on the
direction of movement.
The reference pulse is as wide as the spacing between the two signal edges of
signals A and B, which is 100 nm. The edges of the incremental and reference
signals are synchronised.
Single-ended signals
A+
A-
B+
B-
R+
R-
100nm
Differential signals
100nm
+
-
+
-
+
-
100nm
≈4.1V
≈0.2V
A
B
R
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