different one by assigning the ASCII value (in decimal) of the new escape character to register S2.
3.3Issuing Commands
When the modem is in command state, you can issue commands to the modem by typing them on the keyboard. A command line shall always begin with AT (or at), followed by the command or commands, and completed with a return key. The only exception is A/, which does not require the AT prefix and a return key.
Some commands, such as M1, M2 or M3, require a parameter after the command letter. If the parameter is missing, the modem treats the command as having a parameter of 0. For example, M would be recognized as M0.
When multiple commands are issued in a command line, you can insert spaces between commands to make the command line easier to read.
3.4Command Buffer
The command buffer has a capacity of 40 characters. All the commands you type on the keyboard are stored in the command buffer before the return key is pressed. However, the AT or at, the carriage return, the optional line feed characters, and the spaces in the command line are not stored in the command buffer.
The command line stored in the command buffer is not executed until you have pressed the return key. If the command buffer overflows, the modem sends the ERROR response code upon receiving the carriage return character, and all the commands in the command buffer are ignored.
3.5Deleting Commands
If you make a mistake while typing a command line, you can press the backspace key to delete the last character you have entered. However, the backspace key does not delete the AT prefix.
To delete the entire command line, press the backspace key until every command character (except AT) is deleted. Then, press the return key.
You may change the backspace character to another ASCII character by assigning a new value to register S5. For example,
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