D-Link DMF-560TX, User Manual

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4 DRIVERS INFORMATION
3-1
3. MODEM BASICS
This chapter covers the basic commands and
techniques involved in modem operation. In many
cases, this is the only information you will need in
order to get your 10/100 Fast Et 56K
Fax/Modem PC Card up and running with
communication software, and to start making
connections with your PC Card.
3.1 Understanding AT Commands
The 10/100 Fast Et 56K Fax/Modem PC
Card communicates asynchronously with computers
using AT commands. AT commands are used to
configure and control the PC Card. Commands are
usually sent to the modem in way of communication
software, but can also be entered manually with the
computer keyboard.
Command statements must be written in a specific
form in order for the 10/100 Fast Et 56K
Fax/Modem PC Card to recognize them. A command
statement always begins with the letters
AT or at . It
is then followed by one or more commands and the
<Enter> key.
AT commands can only be issued when the 10/100
Fast Et 56K Fax/Modem PC Card is in
ommand mode” or ff-line.” Once the PC Card has
established a connection with another modem, it is
said to be n-line” or in ata mode.” In this mode,
the characters sent to the E 56K Fax/Modem