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6
Output Signals and Supply
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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
100 μm.
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:
Customer-supplied cable: Female 9-pin D-sub connector
Pin
Signal
1
A-
2
GND
3
B-
4
ERR NOT
5
R -
6
A+
7
+5V DC
8
B+
9
R +
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
Male 9-pin D-sub connector.
Signal type
Quadrature signal
Supply voltage
Quadrature signal
Error signal
Reference signal
Quadrature signal
Supply voltage
Quadrature signal
Reference signal
Interface module with correctly connected
MINISCALE PLUS flexible printed circuit board. The
green LED lights up
21
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