Installation and Configuration
Ndrive QL Hardware Manual
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 2-6:
PSO Specifications
Specification
Value
Maximum Input Tracking Rate
(1)
Single-Axis Tracking
16.6 MHz
Maximum Quadrature Encoder Output
Frequency
Capacitance Sensor Feedback
16 MHz
Maximum PSO Output (Fire) Frequency
(2)
12.5 MHz
Firing Latency
Single-Axis Tracking
160 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.
Table 2-7:
PSO Output Pin Assignment (J108)
Pin
Description
19
Aux Marker - / PSO -
20
Aux / PSO +
21
Common
26
Chapter 2
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