ORIC
®
Piezo Stage Controller PDXC
Chapter 5: Software
Page 26
CTN015391-D02
In closed-loop mode, the encoder feedback signals of position and velocity are measured and compared to the set
value. A PID control loop automatically corrects the driving signal applied to the stages according to the error
between the measured position and velocity and the targe position and velocity. Accurate positioning and velocity
control can be achieved in this mode.
In open-loop mode, only the feedback signal from encoder is monitored. The stages are driven by a default
waveform according to preset configurations.
5.1.6. External Trigger Mode
On the right top corner of the GUI, there is the section where the user can toggle between manual and trigger mode.
When switched to trigger mode, the I/O port on the back panel is enabled to allow users to remotely control the
PDXC. For the electrical characteristics and pin distribution of the I/O port, please refer to Table 3.1.
An I/O cable is also provided to breakout the pins of the I/O port into BNC connectors.
Please be aware that before entering trigger mode, the device should be switched to closed-loop operation and
homing should be performed.
There are three sub-modes of operations: Analog In, Fixed Step Size, and Fixed Positions.
Analog In
In this sub-mode, the user can make use of the
“Analog In” pin of I/O port to set the Target Position,
use the
“Trigger In” pin to initiate a movement towards the target position. The type of trigger edge to
start a movement can also be defined here.
Figure 5.4 Analog In Operation in Trigger Mode
User can adjust Gain and Offset values on the GUI. The target position (which has a maximum range
of -10 mm - 10 mm) is defined as:
Target Position = Gain * Voltage applied to
“Analog In” + Offset.
Fixed Step Size
In this sub-mode, user can make use of the
“Trigger In” pin of I/O port to initiate a movement at the
Step Size defined here. The type of trigger edge to start a movement can also be defined here.
