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CPC2400E

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
I
NTEGRATED
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IRCUITS
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IVISION
CPC2400E
www.ixysic.com
7
R03
Command lines are typed to the modem from the
terminal when the modem is in the Idle or Command
state. The modem does not execute any of the
commands in a command line until after the command
line is ended by the end of line character <CR>. A
command line is a string of char-acters starting with
the A and T characters and ending with a special
end of line character, <CR>. Characters typed before
the AT are ignored. Command lines contain at most
40 characters after the AT, not counting spaces. The
modem does not execute any of the commands in a
command line that is too long.
To Echo command line characters, use the E1
command.
Typing mistakes can be aborted by using a special
Back-Space character, <BS>, after the initial A and T
characters have been entered.
A partial command line can be aborted by typing a
Ctrl-X character. The modem returns an OK result
code and ignores the partial AT command line.
Command lines may contain several commands
one after another. The Answer (A), Dial (D), and Go
On-Line (O) commands usually cause any following
commands in the command line to be ignored.
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 out-side 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 was 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 last command executed is returned
to the terminal. If the value to be 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 zeros in numeric arguments, including
S-register numbers, are ignored. For example,
ATS1=2 and ATS01=2 both set S-register S1 to 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 of data from the
terminal.
A/Repeat Last Command
To repeat the commands in the last 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 de-fault is 13, the ASCII carriage return character.
When the <CR> character is entered, the modem
executes the commands in the command line.
Note: default values in the AT Command Tables are
denoted by bold face type.
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CPC2400E
Command Function and Description
A Answer The A command makes the modem go off hook and respond to an incoming call. Use this command after the
modem has returned the RING result code.
If the modems successfully complete the answering process they each return a CONNECT result code and enter the
On-Line state.
If no transmit carrier signal is received from the calling modem within the time specifi ed in S-register S7, the modem
hangs up, returns the NO CARRIER result code, and enters the Idle state.
Any commands following the answer command on the command line are ignored.
This command is aborted if a key is pressed before the answer process is completed, or when DTR is off if some
options in the &Q or &D commands have been used.
B Communication
Standard Option
The B command tells the modem which special telephone line modulation standards to use. The modem can be
confi gured to use:
B0 Use the ITU-T modulation standards for all telephone line data rates. This includes V.22 for the
1200 bps telephone line data rate and V.21 for the 300 bps telephone line data rate.
B1
Not Supported
&C Data Carrier
Detect Options
&C determines how the modem’s DCD signal relates to the carrier signal from the other modem. This
option takes effect only at the beginning of a telephone line connection. If &C is issued from the
Command state it will not have an immediate effect.
&C0
During asynchronous operation (&Q0 in effect) DCD is on at all times. During synchronous operation
(&Q1) DCD refl ects the state of the carrier signal from the other modem using S-registers S9 and S10.
This is the default value in North America.
&C1 Refl ects the state of the carrier signal from the other modem using S-registers S9 and S10.
D Dial The D command makes the modem dial a telephone call according to the digits and dial modifi ers in the dial string
following the command. Any commands following the dial string on a command line are ignored unless the semicolon
dial modifi er is the last character in the dial string. If the modem was already off hook when the Dial command
was given, the modem dials immediately without trying to detect a dial tone. Characters other than digits and dial
modifi ers in a dial string are ignored, but are counted as characters in the command line buffer.
If line current sensing is enabled, and line current is detected before the modem is taken off-hook when the modem
needs to dial, a NO CARRIER result code is displayed and the modem enters the Idle state. If the modem does not
need to dial (i.e., ATD with no dial string), the modem assumes the call was manually established and attempts to
make a connection.
The D command is not valid when the modem is in the On-Line state.
See DIAL MODIFIERS and MODEM RESULT CODES for more information.
AT Command Set
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CPC2400E
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AT Command Set
Command Function and Description
&D Data Terminal &D determines how the modem responds to the DTR signal from the terminal. The country Ready
Options confi guration may prevent the modem from detecting terminal DTR. In this case, the modem assumes DTR
is always on. In North America, terminal DTR is normally detected. If DTR detection has been prevented, the modem
will respond with an ERROR result to this command.
The response to changes in DTR also depends on the &Q and &D commands. This table defi nes what happens
when DTR goes off for all possible combinations of the &D and &Q commands. To see what happens when DTR
goes on refer to the &Q command. The default value is &D0 in North America:
&D0 &D1 &D2 D3
&Q0 None B C D
&Q1 A B C D
A The modem hangs up the telephone line and issues an OK result code.
B If in the On-Line state, the modem goes into the Command state and issues an OK result code.
C The modem hangs up the telephone line and issues an OK result code. Auto-Answer is disabled as
long as DTR stays off.
D The modem resets.
E Command Mode E tells the modem whether or not to echo characters sent from the terminal when the modem is
Character Echo accepting AT commands.
E0 Does not echo characters sent from the terminal.
E1
Echo characters sent from the terminal. This is the default value in North America.
%E Automatic Retrain
Options
The %E command controls whether the modem will initiate retrain with the other modem during a telephone line
connection during operation in data modes supporting retrain. The modem always responds to a retrain operation
initiated by the remote modem. The modem can be forced to initiate a retrain by the On-Line (O1) command.
%E0 Do not initiate a retrain.
%E1
Initiate a retrain if the datapump indicates one is required.
&F Recall Factory
Profi le
&F changes these AT command options and S-registers to their default values. The default values may be changed
for use in different countries. The values for North America are:
S-registers
S0=0 S1=0 S2=43 S3=13 S4=10 S5=8
S6=2 S7=30 S8=2 S9=6 S10=14 S11=95
S12=50 S17=10 S25=5 S28=0 S29=25 S37=0
Commands
B1 E1 M1 P Q0 V1 X4 &C0 &D0 &G0 &P0 &Q0 %E1
&G Guard Tone
Options
&G tells the modem which guard tone to transmit when the modem is transmitting the high band (i.e., answer
handshake and answer mode).
&G0
No guard tone. This is the default value in North America.
&G1 550 Hz guard tone (V.22 and V.22bis only)
&G2 1800 Hz guard tone (V.22 and V.22bis only)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

CPC2400E

Mfr. #:
Buy CPC2400E
Manufacturer:
IXYS Integrated Circuits
Description:
Modems 2400 Embedded Modem Module
Lifecycle:
New from this manufacturer.
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