Alpha Telecom UTA120, User Manual

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CHAPTER 6: AT Command Set
UTA120 User’s Guide
20
The Call-in-Progress State
The Call-in-Progress state is the transition state between the Command Mode
and the On-Line state. After a call is placed, a connection must be established
within a preset period of time (S7 Register). If a connection does not occur
during the Call-in-Progress state, or if a key on the DTE keyboard is pressed (a
dial interrupt occurs), the UTA120 will abandon the call and re-enter the
Command Mode.
The Escape Command Mode
Once the UTA120 has entered the On-Line state, you may escape from this state
by entering the escape sequence “+++”. The escape sequence will cause the
UTA120 to enter the
Escape Command Mode and respond with the “OK”
message. In the Escape Command Mode, most of the commands can be
invoked just as in the Command Mode. In the Escape Command Mode the
UTA120 does not terminate the connection with the remote side. To return to the
On-Line state from the Escape Command Mode, enter the command “ATO”.
GUIDELINES FOR USING AT COMMANDS
All AT Commands (except the A/ command) begin with the AT prefix and end
with pressing the ENTER key. A typical AT Command line is shown below.
AT Command String <Enter>
AT
Ø
The AT prefix is known as the “ Attention Characters .” It can be uppercase or
lowercase but the UTA120 will not recognize a combination of the cases ( At or aT ).
Ø
It also informs your terminal (UTA120) of your computer’s speed, parity and
character length. The data character formats (how your data is structured) for the
AT Command set.
Ø
It can be set using your communication software. It must be one of the following:
⇒
8 data bits + no 1 stop bit.
⇒
7 data bits + 1 parity bit + 1 stop bit (Parity can be odd, even, mark, or
space.)