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Communicating with the af910, Ommunicating with the, Af910 – Quantum Composers AF910 User Manual

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AF910 Manual Version 1.4

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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

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