Ndrive HP Options
Ndrive HP 10/20/30 User’s Manual
4-16 www.aerotech.com
4.1.9. SSI Net (2 channels) (J302, J303)
Each of the two SSI Net interfaces is a two-channel bidirectional RS-422 interface, most
typically for quadrature encoders. This allows one channel for the sine signal and one
channel for the cosine signal. Alternatively, one of the SSI Net interfaces may be used to
provide an encoder marker signal to another SSI Net interface if used. Each of these two
SSI Net interfaces are both available on the J302 and J303 connectors, as illustrated in
the following table. Note that the J205 encoder channel may also be used as an
input/output for multi-axis PSO firing.
The SSI Net is designed for daisy-chaining encoder signals from one Ndrive to another
for two/three-axis PSO (laser firing). This allows one Ndrive containing the –DUALPSO
or –TRIPLEPSO options to track the vectorial position change of two/three axes in real-
time. These encoder signals may also be used for user-defined purposes. Refer to
Figure 4-16 and Figure 4-17. These four channels are bi-directional and configured via
the PsoSsi1Config and PsoSsi2Config axis parameters; see the Nview help for more
information. Note that SSI Net #1 is also available on the J301 connector (see Section
4.1.8.). The signals from these ports will be the same as the differential line driver
encoder signal input to the Ndrive, unless the –MXH option is present. The signal output,
when the –MXH option is present, will be of a pulse width determined by the –MXH
clock frequency, as indicated in Table Table 3-17.
The SSI Net #1 and #2 interfaces are both physically
hardwired to the J302
and
J303 connectors. If SSI Net #1
is configured as an input, a signal driven into the SSI Net
#1 connections on J302 will also be present on the SSI
Net #1 connections of J303, effectively making SSI Net #1
on J303 an (un-buffered) output of this same signal.
Likewise, this would also be true for the SSI Net #2
interface.
Table 4-15.
J302, J303 2-Channel SSI Net Connector Pin Assignment
Pin #
Label
Description
In/Out/Bi.
1
Sin-N
SSI Net #1 Sin-N
Bi-directional
2
Sin
SSI Net #1 Sin
Bi-directional
3
Cosine-N
SSI Net #2 Cosine-N / Marker-N
Bi-directional
4
Sin-N
SSI Net #2 Sin-N
Bi-directional
5
Sin
SSI Net #2 Sin
Bi-directional
6
Cosine
SSI Net #2 Cosine / Marker
Bi-directional
7
Cosine-N
SSI Net #1 Cosine-N / Marker-N
Bi-directional
8
Cosine
SSI Net #1 Cosine / Marker
Bi-directional
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