Z02215 datasheet(21/74 Pages) ZILOG

21 / 74 page

Z02215

Single Chip Modem with Integrated Controller, Data Pump, and AFE

PS001907-0904

AT Command Set

Command Line Execution

The characters in a command line are executed one at a time. Any unexpected

characters (except control characters) stop command line execution and return an

ERROR

result code. Unexpected characters include numbers outside the range of

values accepted by the command. All control characters in a command line

except Ctrl-X (and the special characters such as <CR> and <BS>) are ignored.

The numerical argument of a command is assumed to be 0 if it is not provided.

For example, the commands ATH<CR> and ATH0<CR> both hang up the telephone

line.

When the modem has executed a command line, the result code of the most

recent command executed is returned to the terminal.

If the value written to a modem S-register is outside the range of values accepted

by the S-register, then its value is set to the nearest allowed value.

Leading 0s in numeric arguments, including S-register numbers, are ignored. For

example, both set S-register S1 to 2:

ATS1=2

ATS01=2

All numeric arguments, including S-register numbers, are decimal (base 10).

AT Command Prefix

Each modem command line begins with the letters A and T. The modem uses

these characters to determine the data rate and parity from the terminal.

A/ Repeat Last Command

To repeat the commands in the most recent command line, type the letters A and /

instead of A and T.

<CR> End-of-Line Character

This character is typed to end a command line. The value of the <CR> character is

stored in S-register S3. The default value is 13 (the ASCII carriage return charac-

ter).

When the <CR> character is entered, the modem executes the commands in the

command line.

Z02215 Datasheet(PDF) 21 Page - Zilog, Inc.