B Hayes Protocol Reference; Programming Commands - Tandy DCM-7 Operation Manual

Hayes protocol ref ere nee
B
Programming commands
AT Attention code
Every command line starts with the attention code. Always enter this code
in uppercase letters. Other commands may be typed in lower- or uppercase
letters.
CR Carriage return
Ends the command line. The Modem does not execute a command until you
press (
ENTER ) •
The carriage return key is defined as 13 in ASCII value.
To redefine it, change the value of register S3.
BS Backspace
You can edit a command line with the @ID key, but the attention code at
the beginning of a command line cannot be deleted. The @
key is defined
as 08 in ASCII value. To redefine it, change the value of register S5.
+ + +
Escape code
Use the escape code to return to command mode from ON LINE. When
you input escape code
+ + + ,
the Modem returns to command mode and
displays the result code OK. The telephone line will remain connected until
you input HO (ON HOOK command) or Z (Reset command).
The escape character can be redefined with register S2. When you redefine
the escape character, do not select characters which are frequently used in
the data line.
The escape code is marked off from data by the escape guard time. This guard
time is inserted between the last character transmitted and the first character .
of the escape code. It is also inserted after the third character of the escape
code. As a result, the escape code is sandwiched by the escape guard time.
The escape guard time can be redefined with register S12. Its default value
is 50 (1 second). When entering the escape code with default values, wait
at least 1 second, input
+ + + ,
then wait 1 second more before entering the
command line. Without the guard time, the Modem cannot recognize the
escape code.
To return ON LINE, enter
ATO (
ENTER) •
39