Quantum Composers AF910 - Manual (Page 17)

AF910 Manual Version 1.4 Page 17
Figure 13 Communication Terminal
Analog and Digital I/O
The AF91x offers several I/O signals to help control and determine status of the unit.
Used in conjunction with the RS232 commands, these can offer a direct method of
determining distance to focus. The pins these signals are available on are listed in the
electrical connection section. The motor controller specific signals are described under
the motor controller section of the manual.
In Range. This signal is an active low output (open collector) that indicates when the
sample is inside the docking range window or inside the linear range. There is also an
LED indicator on the outside of the unit for this status.
In Focus. This signal is an active low output (open collector) that indicates when the
sample is inside the focus range window. When this status is active, the motor controller
function will be stopped. There is also an LED indicator on the outside of the unit for this
status.
EMO (Emergency Machine Off). This is an active high input that will stop all functions
of the autofocus unit when activated. The analog output will be zeroed and the motor
control functions will be stopped.
Laser Disable. This is an active low input (pull to 0V to activate) that will turn off the
laser diode and temporarily stop the motor control. Once the input is activated again (or
released), the laser diode will turn back on. The motor control functions (step) will stop
when this is disabled and must be manually enabled again. The analog output will
automatically start updating when released.
AF Status. This is an active high output that indicates when the autofocus has been
enabled.
Analog Output. This signal outputs a ±10V signal based on the distance from the
calibrated focus point. An output of zero volts will indicate that you are in focus. When
the output “clamps” at the maximum of ±10V, the unit is indicating you are outside of the