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Ndrive HL User’s Manual
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www.aerotech.com 4-17
4.1.9.
SSI Net (2 channel) (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 HL to
another for two/three-axis PSO (laser firing). This allows one Ndrive HL 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 4-17 and Figure 4-18. These four channels are bi-directional and
configured via the PsoSsiConfig 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 HL, 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 3-17.
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/Bidirectional
1
Sin-N
SSI Net #1 Sin-N
Bidirectional
2
Sin
SSI Net #1 Sin
Bidirectional
3
Cosine-N
SSI Net #2 Cosine-N / Marker-N
Bidirectional
4
Sin-N
SSI Net #2 Sin-N
Bidirectional
5
Sin
SSI Net #2 Sin
Bidirectional
6
Cosine
SSI Net #2 Cosine / Marker
Bidirectional
7
Cosine-N
SSI Net #1 Cosine-N / Marker-N
Bidirectional
8
Cosine
SSI Net #1 Cosine / Marker
Bidirectional
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