Ensemble LAB Hardware Manual
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
Maximum Input Tracking Rate
Maximum Quadrature Encoder Output
Frequency
Maximum PSO Output (Fire) Frequency
Firing Latency (3)
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
19
Auxiliary Marker- / PSO output
20
Auxiliary Marker+ / PSO output
23
Analog Common
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(1)
Single-Axis Tracking
Standard Feedback
-MXR Feedback
(2)
Single-Axis Tracking
Chapter 2
Installation and Configuration
33.3 MHz
40 MHz
16 MHz
12.5 MHz
80 nsec
Bidirectional
Bidirectional
Value
In/Out/Bi
-
47