Specifications

Section 4 — Operation
4.1 Overview
Since the DAI-2 is controlled by DTMF tones, operating the unit always begins by calling the number where it is
located. The DAI-2 must be connected through a telephone line, even when bench testing, because (normally) the
unit does not normally provide the necessary operating voltage to the telephone. No special phone line or equipment
is required but the controlling telephone must be able to produce DTMF tones. These are the tones generated by the
buttons on a TouchTone® telephone.
The DAI-2 responds to DTMF according to user adjustable programming. Every key on the telephone keypad except
the ❊ key can be programmed to change the state of the output relays or to change the audio switching in the DAI-2.
The ❊ key is used as a function key to change system programming, etc.
4.2 Operation from a Remote Telephone
4.2.1 Going Online with the DAI-2
The DAI-2 will answer the line after two rings (under factory programming) and signal that it has seized the line with
one long tone. Enter the main security code using the telephone keypad. The main security code is factory
programmed to "12345678". After the security code is correctly entered the DAI-2 responds with two short tones. If
the security code is entered incorrectly, the unit will drop the line immediately.
4.2.2 Issuing Commands
The DAI-2 is controlled using one and two digit commands from the keypad of a telephone. The digit keys 0-9 and the
# key cause the unit to perform actions as programmed in user programming with the press of a single key. How the
DAI-2 responds to key presses is determined by a table stored in memory. You indicate how you want the DAI-2 to
respond to each available key by placing specific values in the table. This table effectively forms the command set
for the DAI-2. Command sets are discussed later in this section.
4.2.3 Shift Key Commands
In the DAI-2, the ❊ key acts as a shift key which, in conjunction with a second key, causes the unit to perform a
specific pre-programmed action. These actions are controlled by the DAI-2 and are not programmable by the user.
Shift Key DAI Function
❊7 Enter programming read mode
❊8 Enter programming write mode
❊99 Hang up
❊0 Read firmware version
❊❊ Shift/Unshift (shift key acts like a toggle)
❊#, 1-6 Reserved for future use
4.2.4 Going Offline with the DAI-2
To end a session with the DAI-2 simply hang up the telephone at any time. The DAI-2 should hang up automatically.
To force the DAI-2 to hang up, press ❊ 99 (two nines). The unit will respond with a series of ten short warning tones
and, at the end of these tones, it will drop the line. Pressing any key while the unit is sending the warning tones will
terminate the hang up sequence and keep the unit in operating mode.
DAI-2 Operation page 4. 1