2.3.1. Position Synchronized Output (PSO)
Program the Position Synchronized Output (PSO) to generate an output that is synchronized to the
feedback position of an axis. PSO is typically used to fire a laser or trigger an external hardware device.
A PSO firing event can be triggered from a feedback channel or from a software trigger. You can get
quadrature signals from feedback channels and PSO firing event signals after a PSO firing event occurs.
When the PSO generates pulses, minimum latency occurs between the trigger condition and the output.
Aerotech recommends that you use an RS-422 line receiver or an opto-isolator if your system:
l
Uses cables with long lengths in work areas where a lot of electrical noise occurs.
l
Uses high-frequency pulse transmission.
For best performance, put the RS-422 line receiver or the opto-isolator near the electronics that receive
the PSO output pulse.
Table 2-11:
PSO Pins on the Laser Output A Connector
Pin #
Label
Description
In/Out/Bi
1
O1+
Laser Output 1+ / PSO Output
Output
2
O1-
Laser Output 1- / PSO Output
Output
Table 2-12:
PSO Pins on the Laser Output B Connector
Pin #
Label
Description
In/Out/Bi
1
O1
Laser Output 1 / PSO Output (5V TTL)
Output
2
GND
Ground
N/A
Table 2-13:
PSO Specifications
Specification
Value
Maximum PSO Output (Fire) Frequency
TTL
12.5 MHz
Isolated
5 MHz
Output Latency
[Fire event to output change]
TTL
50 ns
Isolated
150 ns
1. Signals in excess of this rate will cause a loss of PSO accuracy
GL4 Hardware Manual
2.3.1. Position Synchronized Output (PSO)
www.aerotech.com
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