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Palmtop3 User’s Guide
Part # 400670-A
35
If the Dual Switch option is selected in the Method drop-down menu, you will step through the rows and
columns manually using one of your switches. The other switch will select the currently active row or column,
just as it does when autoscanning. If you are capable of making a lot of switch activations, dual switch
scanning can be a bit faster than single switch scanning.
The switch (or switches) used to control scanning can be set by selecting the Configure button. When you
select this button, a new dialog will open. For single switch scanning you can set the group select switch
using the
Select control, while for dual switch scanning you can set both the group select and group advance
switches, using the Select and Advance controls. Switches are selected from a list that includes the arrow
keys, external switches, and rocker buttons (the cursor button on the front of the Axim - see Figure 1). If you
are using external switch inputs connected to an external switch box, you can set the switch source using
the
Serial drop-down menu ( COM1 is used for the Palmtop serial port).
4.7.2. Scanning Dialog: Delays Section
When using a single switch for scanning, the system steps through the individual rows and columns at a
fixed rate. You can increase this delay to make scanning go slower, or decrease the delay to make scanning
go faster. The default delay time is one second. You can change the delays in increments of 0.05 seconds
(50 milliseconds). The group delay controls (
First Group and Inter-Group ) allow you to set the delays for the
"top level" scanning groups. If you are using a row-column matrix, for example, these controls would
determine the delay between row advances. The item delay controls (
First Item and Inter-Item) , on the other
hand, allow you to set the delays between items after you have already selected a group. In a row-column
matrix, these controls would determine the delays between column advances.
The standard delays for groups and items are set using the Inter-Group and the Inter-Item controls. Because
it can be difficult to make two-switch activations immediately following one another - such as when you need
to select the very first group or item in a scanning group after selecting that group - you can set different
delays for the first group or item and all of the rest of the items. This is done using the
First Group and First
Item controls.
By default, most of the configurations provided with your Palmtop device are set up to use either row-column
or group-row-column scanning. If you would prefer to scan linearly through each button on a page, check the
Linear Scan box. This option is particularly useful for small symbol grids for which row-column scanning is
often less efficient. If you have a symbol page with a number of blank buttons on it, you might want to check
the
Skip Blanks box. When this feature is enabled, scanning will skip right over blank buttons (and whole
rows containing only blank buttons).
4.7.3. Scanning Dialog: Miscellaneous Section
If you need extra time to get ready for timed scanning after each item is selected, check the Wait for Switch
to Start box to automatically put the software in a paused state after each character (or word) is selected.
You might enable this option, for example, when using a word prediction list, so that you have some extra
time to look over the list before starting the scan. To start scanning, activate your switch once.
The color of the rectangle used to show which group is highlighted during scanning can be changed by
selecting the
Color button. This will display a dialog from which you can select the desired color.
Alternatively, if you select the Invert Colors box, the scanning highlight will be indicated by inverting all of
colors within the scanning box (like a photographic negative). This option can be helpful if you have trouble
seeing the colored outline of the standard scanning box.