Filter
Top Products
Chapter 3 - Basic Modem Operation
3-2
Bits per second: 57600
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: Hardware
Click “OK” when finished. After you have done this, save your new connection
by selecting “Save” from the “File” menu and click “OK.” A new connection
icon will be added to your Hyper Terminal folder.
You are now ready to start entering AT commands.
In the terminal window, type:
AT<Enter>
Omni 288S responds
OK
This confirms that the modem and your computer are communicating correctly.
To test the telephone line connection issue the manual answer command.
Type:
ATA<Enter>
The Omni 288S will pick up the phone line, and try to communicate. Normally,
this command is only used to answer an incoming call made from another modem.
Thus the high pitched noise you will hear from the speaker. To abort the
operation, press any key, or select “Disconnect” from the “Call” menu.
Dialing and Answering Techniques
Depending on what communications software you use to make modem
connections, you may not have as much control of how the modem dials the
telephone number. This section shows some useful examples of the AT commands
used for dialing and answering operations. The command characters specific to
each function are shown in bold type.
Dialing using the ATD Command
Touch Tone Dialing: ATD
T
555 1212
Pulse Dialing: ATD
P
555 1212
Tone and Pulse Dialing: ATD
P
555 1212 W
T
24
Dialing Through a PBX: ATDT 9
W
555 1212
Note: The 'W' in the dial string will cause the modem to wait for a
second dial tone before it continues to dial.