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6
Output Signals and Supply
6.2 / 6.3 Output Signals and Supply
The maximum output frequency of the digital interface module is 8 MHz per
channel. This means that the A signal and B signal can each have a maximum
frequency of 8 MHz. For a 4-edged evaluation of the A/B signals, a count rate of
32 MHz occurs, corresponding to a maximum speed of 3.2 m/s at a pitch of
100μm.
6.3.2 Signaling
In order to increase the resistance to interference, transmitting the signals in an
interpolated form is recommended. Transmitting signals in opposite phases
symmetrically can almost entirely prevent interference.
A pair of wires is used to transmit the A+ signals and the inverted A- signals.
The B+, B- and reference signals R+ and R- are transmitted differentially using the
same method (RS 422). At the receiver, the signal is generated by creating the
difference based on the difference between the two voltage levels.
6.3.3 Pin allocation for the digital TTL/CMOS interface module (IM SCPD)
Interface module: Male 9-pin D-sub connector.
Customer-supplied cable: Female 9-pin D-sub connector
Pin Signal Signal type
1 A- Quadrature signal
2 GND Supply voltage
3 B- Quadrature signal
4 ERR NOT Error signal
5 R - Reference signal
6 A+ Quadrature signal
7 +5V DC Supply voltage
8 B+ Quadrature signal
9 R + Reference signal
6.3.4 Function Check
The green LED will light up if the MINISCALE PLUS is correctly supplied with
power.
Interface module without MINISCALE PLUS flexible
printed circuit board Both the green and red LEDs
light up
Interface module with correctly connected
MINISCALE PLUS flexible printed circuit board. The
green LED lights up
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