Black Box MD1641A Manuale Utente

5. Command Mode

AT commands are the means by which you, and your communications
software, are able to communicate with and configure your modem.
They enable you to establish, read, and modify parameters in addition
to dialing. The following provides both a summary and a detailed
explanation of the AT commands recognized by the Series II Modem.

The 

key on your keyboard can be used to edit characters

in the AT command line. An AT command is not executed until the
RETURN key is pressed. The BACKSPACE key erases the previous
character for reentering.

The 

key does 

erase the 

characters once they are

entered. If your keyboard has no 

key, 

does the

same thing. The character recognized by the modem as 

may be changed to any other ASCII character with S-Register S5.

If you wish to cancel an entire command that has been entered but not
yet executed, enter 

. This also clears the command buffer. The

effect is the same as backspacing to cancel the entire command, only
quicker.

Characters entered in a command are stored in the modem's Com-
mand Buffer (memory) until executed by hitting RETURN. The
Command Buffer's capacity is sixty characters. The Attention Characters

do not count in the sixty allowed Command characters. Spaces,

which may be used for increased display readability, may be used when
entering a command, but are not stored in the Command Buffer and
are not counted in the sixty allowed characters. Hyphens, parentheses,
etc. are not allowed.

If the sixty character limit is exceeded or if invalid characters are
entered, the Command Buffer automatically erases, and an 

message appears. You would then re-enter your command within the
sixty-character maximum, using only the allowed characters.