Ensemble LAB Hardware Manual
Installation and Configuration
2.5.2. Position Synchronized Output (PSO)
The PSO can be programmed to generate an output synchronized to the feedback position and is typically
used to fire a laser or sequence an external device. Trigger signals may be derived from a feedback channel
or a software trigger. The position synchronized output pulse is generated using high-speed hardware,
allowing minimal latency between the trigger condition and the output.
The PSO output is available on the dual-function AUX Marker/PSO signal lines. The auxiliary marker must
be configured as an output using the PSOOUTPUT CONTROL command. Refer to the Help File for more
information.
An RS-422 line receiver or opto-isolator is recommended, especially when using long cable lengths in noisy
environments or when high frequency pulse transmission is required. It is best to locate the line receiver or
opto-isolator close to the receiving electronics.
Table 2-17:
PSO Specifications
Specification
Value
Maximum Input Tracking Rate
(1)
Single-Axis Tracking
33.3 MHz
Maximum Quadrature Encoder Output
Frequency
Standard Feedback
40 MHz
-MXR Feedback
16 MHz
Maximum PSO Output (Fire) Frequency
(2)
12.5 MHz
Firing Latency(3)
Single-Axis Tracking
80 nsec
1.
Signals in excess of this rate will cause a loss of PSO accuracy.
2.
The optocoupler that you use on the output might have an effect on this rate.
3.
MXR encoder multiplier options have an additional latency of ~3.25 microseconds between the measurement position and the
update of the PSO hardware.
Table 2-18:
PSO Pin Assignment
Pin#
Description
In/Out/Bi
19
Auxiliary Marker- / PSO output
Bidirectional
20
Auxiliary / PSO output
Bidirectional
23
Analog Common
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