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PROXIMA USB
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 Proxima USB Fax/Modem up and running with communication
software, and to start making connections with your USB Modem.
3.1
Understanding AT Commands
The Proxima USB Fax/Modem 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 Proxima
USB Fax/Modem 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 56K Fax/Modem is in "command
mode" or "off-line." Once the Proxima USB Fax/Modem has established a
connection with another modem, it is said to be " on-line" or in "data mode." In
this mode, the characters sent to the Proxima USB Fax/Modem by your
computer are transmitted to the remote modem rather than being interpreted by
the modem as commands.
To issue an AT command statement, you first need to run a communication
program such as the Microsoft Windows "Hyper Terminal" program. This
program provides a simple method to manually enter AT commands so you can
do such things as "customize" the settings of your Proxima USB Fax/Modem ,
or store phone numbers you commonly connect to.
Once the Proxima USB Fax/Modem is connected to your computer's USB
connector and telephone line, open the Windows 98 "Accessories" program
group, and open the Hyper Terminal Program. The program will prompt you for
a name and icon to use for your new connection. Type the name Test
Connection then press <Enter>.
Next, you will be prompted for country information, area code, phone number,
and the device used to make the connection. For this test purpose, do not enter
a phone number; simply choose the COM port your Proxima USB Fax/Modem
is connected to from the "Connect Using" list. Click "OK" when finished.
The next window sets the COM port settings. The settings used should be as
follows:
Bits per second:
Data bits:
Parity:
Stop bits:
Flow Control:
53
115200
8
None
1
Hardware
BAUSCH DATACOM
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