Quantum Composers AF910 - Manual (Page 25)

AF910 Manual Version 1.4 Page 25
- Focus Windows. Various windows can be adjusted to improve the
performance of the motor control loop when approaching and stopping at the
target focus position. There are three (3) windows that can be adjusted that
affect how the motor speeds are utilized when in automatic mode.
o Focus Target Window. This is the absolute focus target variation. A ±
range that the focus signal can be within before the In Target Focus
condition is set and the motor movement is stopped. The FT command is
used to adjust this value.
o Focus Range Window. A ± range that the focus signal can be within
before the In Focus Range condition is set. Motor movement will not be
started until the focus signal level is greater than this value. The FR
command is used to adjust this value.
o Docking Range Window. A ± range that the signal can be within before
the Docking Range condition is set. When the focus signal is within this
window, the stage speed will be reduced to the slower speed. When
outside of this window, the high motor speed will be used. This allows the
motor to slow down when approaching the target focus so that
overshooting does not occur. The DR command is used to adjust this
value.
Figure 28 Focus Windows
Communicating with the AF910
The AF91x communicates via a standard RS232 connection. The default communication
settings are 57,600 baud, 8 data bits, even parity and 1 stop bit (57600, 8, E, 1). A typical
serial port pin out is shown below. Only the Rx, Tx and Gnd are used to communicate
with the AF91x. The included software can be used to operate the unit over the serial port
at the default baud rate of 57,600.
Typical PC Serial Port (DB9)
Pin No. Name Description
1 DCD
Data Carrier Detect †
2 Rx RS232 Receive
3 Tx RS232 Transmit
4 DTR
Data Terminal Ready †
5 Gnd Ground
6 DSR
Data Set Ready †
7 RTS
Request to Send †
8 CTS
Clear to Send †
9 RI Ring Indicator †
† denotes signal not used by the autofocus