Ndrive HP 10/20/30 User’s Manual
Options
www.aerotech.com
4-13
4.1.8. PSO / Absolute Encoder Interface (J301)
This connector utilizes the RS-485 port and the (analog sine wave) encoder channel as an
absolute encoder interface. The absolute encoder channel accepts a differential analog
encoder up to 200 kHz. Typically, this is a 1 Volt P-P signal varying about a 2.5 Volt
reference. The two RS-422 channels provide buffered and/or multiplied MXH encoder
signals to the user, for laser firing or other purposes. Additionally, the –IOPSO option
provides a RS-422 output and an open-collector laser-firing signal to the user. Only one
of these signals may be used, as illustrated in Figure 4-14. Jumper JP3 defines the active
state of the open-collector output, which has three options, as defined in Table 4-12. See
Section 3.2 for more information on the laser firing (PSO) option. Note that the two RS-
422 channels are two of the same channels available on the J302 and J303 connectors.
For information on the RS-422 ports, see Figure 4-16 in Section 4.1.9.
See Figure 4-14 for the firing output.
Table 4-12.
PSO / Absolute Encoder Interface Connector Pin Assignment (J301)
Pin #
Label
Description
In/Out/Bi
1
Chassis Frame Ground
Chassis Frame Ground
N/A
2
Sin-N
SSI Net #1 Sin-N
Bi-directional
3
Sin
SSI Net #1 Sin
Bi-directional
4
Cosine-N
SSI Net #1 Cosine-N / Marker-N
Bi-directional
5
Cosine
SSI Net #1 Cosine / Marker
Bi-directional
6
Common (+5 Volt External)
Common
N/A
7
Absolute Sine + Input
Absolute Encoder Interface
Input
8
Absolute Sine - Input
Absolute Encoder Interface
Input
9
Absolute Input
Absolute Encoder Interface
Input
10
Absolute Cosine – Input
Absolute Encoder Interface
Input
11 PSO-IOC/RS-422-M
Output
PSO
/ RS-422 - Output *
Output
12
RS-422-P Output
RS-422 +
Output
13
+5 Volt External – See Pin 6
Ex5 Volt supply
Output
14
RS-485-M
RS-485 – for Abs. Encoder
Bi-directional
15
RS-485-P
RS-485 + for Abs. Encoder
Bi-directional
Table 4-13.
PSO / Absolute Encoder Mating Connector (J301)
15-pin D-Style
Aerotech
Third Party Source
Connector
ECK00100
Keltron P/N DN-15PYSH-G
Back shell
ECK01022
Amphenol P/N 17-1725-2
We recommend using the opto-isolated output, where
possible, to maintain the isolation between the Ndrive HP
and the laser. This prevents noise and current spikes
(from laser firing pulses) from being conducted through the
Ndrive. This requires the user to power the opto-isolator at
TB303 (see Section 4.1.5. for more information).
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