MagicSurfer 56K
User’s Guide
Page 24
AT Command Set
AT commands communicate directly with the modem when it is in command modem.
This section is a quick reference for experienced modem users. We do not
recommend that you use AT commands unless you are familiar with them. It is
possible to disable your MagicSurfer 56K Internal PCI Modem inadvertently.
To Summarize AT command syntax:
•
Multiple commands can be strung together in one line.
•
Command lines cannot exceed 40 upper or lower-case characters (do not mix
upper and lower case). The modem ignores space and hyphen characters
•
Command lines must start with AT and end with a carriage return (Return or
Enter).
•
A missing command parameter is assumed to be zero. For example ATH is the
same as ATH0.
•
A/ on a line by itself without a carriage return causes the modem to repeat the
previous command.
Commands are accepted by the modem while it is in Command Mode. Your modem is
automatically in Command Mode until you dial a number and establish a connection.
Commands may be sent to your modem from a PC running communication software
or any other terminal devices.
Comman
d
Function
AT
Attention - this precedes all commands except A/
A/
Execute previous command - does not require a
<CR> *
A
Causes the modem to go off hook. If a call is coming in, the modem
will try to answer it. The procedure for answering a call is a short
silence and then an answer tone. Sending a character to the modem
during this procedure will abort the answer procedure. The amount of
time the modem will wait for a carrier is programmable by modifying
the S7 register.
B0
B1
B2
Select CCITT V.22 (1200 bps)
Select Bell 212A (1200 bps)
Select CCITT V23
Originate mode will transmit data at 75 bps and receive data at 1200
bps. Answer mode will transmit data at 1200 bps and receive data at
75 bps. The command N0 (Disable auto mode) must be selected.
D
D alone will take the modem off-hook and wait for a dial tone. (See X
command for exceptions) The length of time to wait for a dialtone
before dialing is programmable in register S6.
