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Getting the attention of the modem.
A modem operates in two modes: commands and data
mode. To get the attention of the modem the special
string of '+++' is sent to the modem. This causes
the modem to leave the data transfer and respond
to commands. Thus:
1 |
Get the attention of the modem
by sending +++ to it. |
Debugging the modem
Once you have the attention of the modem, the AT
&V command can be used to view the status of
the registers in the modem:
1 |
Enter the AT command of AT &V. |
| |
 The
S00 register contains the rings to auto-answer.
What value is this?
The
S01 register contains the rings counter. What
value is this?
The
S02 register contains the escape character.
What value is this?
The
S03 register contains the carriage return
character. What value is this?
The
S06 register contains the wait time for dial
tone. What value is this?
The
S07 register contains the wait time for carrier.
What value is this?
The
S08 register contains the pause time for automatic
dialing. What value is this?
The
S10 register contains the pause time for automatic
dialing. What value is this?
The
S12 register contains the escape code guard
time. What value is this?
The
S29 register contains the Flash dial modifier
time. What value is this?
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| |
It is also possible to
view individual registers with:
AT
S0?.
AT
S1?.
AT
S2?.
AT
S3?.
AT
S4?.
and registers are set with the following
format:
AT
S0=10.
AT
S1=7.
|
Checking product code/ROM details
The I registers contains information on the modem.
1 |
Enter the AT command of AT
I0 for product code.
Enter the AT command of AT
I1 and for AT
I2 for ROM checksum.
Enter the AT command of AT
I3 for product revision code.
Enter the AT command of AT
I4 for response programmed
by OEM.
Enter the AT command of AT
I5 for country code. |
Setting word or digit result code
The modem will either gives words back as messages
(such as OK, NO CARRIER, and so on), or numeric
codes.
1 |
Enter the AT command of AT
V0 for numeric codes.
Enter the AT command of AT
V1 for words. |
Setting speaker volume
The AT Ln command is used to set the speaker volume
for the modem:
1 |
Enter the AT command of AT
L0 for low volume.
Enter the AT command of AT
L2 for medium volume.
Enter the AT command of AT
L3 for high volume.
|
Speaker mode
The AT En command is used to set the operation
of the speaker:
1 |
Enter the AT command of AT
M0 for Speaker off.
Enter the AT command of AT
M1 for Speaker off while receiving
carrier.
Enter the AT command of AT
M2 for Speaker is always on.
Enter the AT command of AT
M3 for Speaker on when dialing,
then off.
|
Command echo
The AT En command is used to set whether the AT
command is echo'ed back:
1 |
Enter the AT command of AT
E0 for no echo.
Enter the AT command of AT
E1 for echo.
|
Tone/pulse dial
The modem uses tone dial with AT T,
or pulse dial with AT P.
1 |
Enter the AT command of AT
T.
Enter the AT command of AT
P. |
Go on-line and into answer mode
The modem is told to go into an answer mode with
the AT command of AT A.
1 |
Enter the AT command of AT
A.
If you are not connected to a telephone line,
the modem will wait for a time-out period,
and will display the message: NO CARRIER,
else it will wait for a call. |
| |
|
Making a call
The modem is told to dial a remote modem with the
AT command of AT D.
1 |
For example to dial the number of 123456,
the AT command of AT
D 123456.
The emulator simulates the non-connection
of the modem to the phone line (based on a
random event). If it displays a message of
NO DIALTONE, keep trying the AT D 123456 command.
Otherwise you will get a message that says
you are connected, such as CONNECT 9600. You
will then get messages from the other side
of the connection. |
2 |
Type messages which will be sent to the
other side. The other side should also send
messages to you.
|
3 |
Put the modem back into commands
mode with a +++.
|
Hang-up a connection
The modem is told to hang-up a connection with
AT H.
1 |
Enter the AT command of AT
H. |
Test modes
The analogue loopback test is defined with AT
&T1.
1 |
Enter the AT command of AT
&T1. The commands will
then be echo'ed back from the modem. To gain
control of the modem enter +++.
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If you would like to register the modem emulator,
or obtain the full version, please complete the
following:
Purchase emulator
|
