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76 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD
Modem AT Commands & S-Registers
string. The AT command is not executed until you press ENTER. Use the
BACKSPACE key to erase the previous command character. It will not
erase the AT characters once they are typed. If your keyboard has no
BACKSPACE key, use CTRL+H. (You can change the character recognized
by the modem as BACKSPACE to any other ASCII character by changing
register S5.)
Press CTRL+X to cancel an entire command that has been typed but not yet
executed. This also clears the command buffer. The effect is the same as
backspacing the command, only quicker.
The modem stores characters entered in a command in its command buffer
until they are executed by pressing ENTER. The command buffers capacity
is 40 characters. The attention characters (AT) do not count toward the 40-
character command line maximum. You may use spaces for increased
readability when typing a command. Spaces are not stored in the command
buffer, and they do not count towards the 40-character command line
maximum. Special characters, such as hyphens and parentheses, are not
allowed.
If you exceed the 40-character limit or type invalid characters, the
command buffer is automatically erased and an ERROR message appears.
Retype the command within the 40-character limit, using only the allowed
characters.
The commands in this chapter are organized by function. Abbreviated
commands are listed on the next page by function along with a short
description and page numbers that refer to a more detailed description,
immediately following this list.
Topic Command Description
Dialing Action, p. 79 D Dial
H On-hook/off-hook
Dial Modifiers, p. 79 L, P, T, W Command accepted, but
has no function
, Command accepted, but
has no function
; Command accepted, but
has no function