•
Single Switch (standard):
Scanning will step through the rows at a constant rate until you activate
the switch. At that point, the system will step through the columns of the selected row until the switch
is activated to select an individual symbol, word or letter.
•
Single Switch (inverse):
Same as standard mode, except that instead of pushing the switch to
indicate a selection, scanning proceeds as long as the switch is held down. When you want to make
a selection, release the switch.
•
Dual Switch:
One switch is used to advance the highlight group and the other is used to select the
highlighted group.
3.16.2. Attaching the Switch Box
Individuals that will be using an external switch will also need to purchase an external switch box accessory.
The switch box is designed to connect up to five switches. The switch box attaches to the sync cable
connector on the left side of your Palmtop device (see Figure 3). The Palmtop device does not ship with a
serial cable. When you purchase a switch box from DynaVox, you should specify that it is for a Palmtop.
DynaVox will include a Palmtop serial cable with the switch box. Each port on the switch box supports a
single switch with a standard 1/8" connector.
3.16.3. Configuring the Scanning Options
The scanning options allow you to configure all of the parameters associated with your chosen method of
scanning. Open the
Tools
menu and choose
Options
to open the
Options
dialog. On the
General
tab, mark
the box next to
Scanning
, then select the
Configure
button to open the
Scanning
dialog.
The
Method
drop-down menu allows you to choose the scanning method. The
Configure
button allows you
to choose which physical switches perform what action. For standard single switch scanning, the
Advance
switch specification is unavailable because the scanning advance is controlled by the delay times. For
inverse single switch scanning, the
Select
switch specification is unavailable because a selection is initiated
by the release of the advance switch. For dual switch scanning, you must select both the
Advance
and the
Select
switches. If any of the external switches (Switch 1-5) are chosen, you will be required to select the
Serial
port to which the switch box is connected. The default setting is COM 1, which corresponds to the
switch box attachment procedure described in section 3.16.2.
Note:
The four-directional "cursor" button at the bottom of the front face of your Palmtop device
(see Figure 1) can be used as a scanning switch.
The delay settings in the
Scanning
dialog control the amount of time that a group or item is highlighted
during single switch scanning. The
First Group
delay and the
First Item
delay control the delay after a group
or item selection. The
Inter-Group
delay and
Inter-Item
delay control the delays that occur while the highlight
box is moving through a series of groups or items. You can experiment with the settings until you find a set
that is comfortable.
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