Multi-Tech Systems ISIHP-4U, ISIHP-4SD manual Has no function

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 buffer’s 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

76 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD