Black Box 3600 Monitor Display, Command Statement Buffer, Backspace Key, Repeating a Command a

AT Commands

Monitor Display

As commands are typed they appear on the monitor so the operator can verify the input. This is called local character echo. The echo may be turned on or off using AT commands. Refer to the “Local Character Echo E” section on page 5-22 for details.

Command Statement Buffer

The modem temporarily stores up to 80 characters in the command buffer. If this limit is exceeded, the modem does not accept the command and sends an ERROR message. To correct this condition, retype the command using 80 characters or less.

The AT characters and punctuation used in telephone numbers do not take up space in the buffer. Blank characters used as spaces to help increase readability are not counted. For example, the modem reads the commands:

ATD (212) 554-1212

ATD2125551212

ATD 212 555 1212

as having 11 characters each. Commands can be typed in any of these forms.

Backspace Key

Use the backspace key to change the command statement or correct errors. The backspace key allows the cursor to be moved back to the character(s) in error. The command can then be retyped from that point.

Example: ATD5551211 has been typed. To change the last 1 to 2, press the backspace key once, type 2, and press Enter to execute the command.

Repeating a Command A/

This command tells the computer to repeat the last command stored in its buffer. It automatically reexecutes the command without retyping. The return key does not need to be pressed.

Example: The ATD5551212 command has been executed, and the phone is busy. To repeat the instruction type A/. Do not use AT before this command: AT empties the buffer.

5-4 Modem 3600