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7K • Chapter 3
Valid Digit and Time Detection
As shipped from the factory, the DTMF decoder requires about 40mS to detect
a valid digit. The microprocessor scans the decoder once every 10mS to see if
a digit has been detected. Thus, it can take about 50mS to store a valid digit.
Allowing a 50mS pause between digits, the controller is able to store about 10
digits per second. Since these are best-case times, use longer durations and
pauses if you wish to reliably program the controller with automatic DTMF
sending equipment.
In the following section of the manual, we will discuss the basic structure of
control commands.
Control Command Structure
All control commands follow the format as shown in Figure 1.
(Add Figure Here!)
Figure 1
A control command always begins with a Security Password—generally
referred to as "Password," and using the symbol "(PW)" in this manual.
• The default security password is 99.
• The password increases the security of the system.
• It can be changed at any time.
• The password can be 2, 4, or 6 digits long, and may consist of any
combination of the numbers 0–9, and the letters A, B, C and D.
• Star (*) and pound (#) are not allowed in passwords.
• The controller supports several passwords, used in programming the
system and in accessing the Autopatch.
Note: Choose a security password immediately! If you begin creating
macros using the default password and later wish to change it, all your
commands will have to be re- entered using the new password.
3-2
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