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Palmtop3 User’s Guide
Part # 400670-A
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Note: For general information on Morse code, Dr. Thomas King's book, Modern Morse Code in
Rehabilitation and Education: New Applications in Assistive Technology is recommended.
Figure 15: The Morse Code Dialog
4.8.1. Morse Dialog: Switch Assignment
On your Palmtop device, the Morse code selection method can be used with one, two, or three switches.
Use the
Mode drop-down menu to set the number of switches that you want to use. It is recommended that
you use as many switches as you can easily operate. The fewer switches you use, the better you will have
to be at timing your switch hits. Use the
Dot , Dash , and End drop-down menus to define the switches that
you will be using. The End switch is used in three-switch Morse code to indicate the end of each character.
You can use standard switches (1/8" plugs) with the external switch box available from DynaVox, or you can
use the buttons on the Palmtop device itself as switches.
4.8.2. Morse Dialog: Switch Timing
The controls in the Time column are used to configure the timing parameters of Morse Code. If you are using
one switch, you will need to set the Dash time. This is the longest time you can hold down the switch and
still get a dot. Holding it down longer will produce a dash. The End time is the amount of time required
between dots and dashes to indicate the end of a character. The Dash and End times are usually set to be
about the same. If you are using two switch Morse Code, you do not have to set a Dash time, but you still
must set a End time so that the system knows when you are done with each character. If you are using three
switches, you do not need to set a time for either dots or dashes.
If you hold any switch down for the amount of time indicated by the Alarm box, a brief alarm will sound. If
you are using two or three switches, you can use the Repeat box to set the amount of time that a switch
must be held down before it starts repeating.
Historically, telegraph operators using Morse code would indicate spaces between words by inserting a long
pause. Most Morse code communicators do not use this method because it is too easy to insert accidental
spaces. However, if you are very good at using morse code with one or two switches, you may want to
check the
Auto Space box. When Auto Space is enabled, a pause equal to twice the End time will yield a
space.
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