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2.4.1. 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 as either a TTL or RS-422
formatted signal (software configurable).
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 2-5:
PSO Specifications
Specification
Maximum Input Tracking Rate
Maximum Quadrature Encoder Output
Frequency
Maximum PSO Output (Fire) Frequency
Firing Latency
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.
Table 2-6:
PSO Output Pin Assignment (J108)
Pin
Description
19
Aux Marker - / PSO -
20
Aux Marker + / PSO +
21
Common
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(1)
Single-Axis Tracking
Capacitance Sensor Feedback
(2)
Single-Axis Tracking
Chapter 2
Installation and Configuration
Value
16.6 MHz
16 MHz
12.5 MHz
160 nsec
25