Sierra Wireless DART 200 CDPD Modem - Manual (Page 96)

DART 200 CDPD Modem User’s Guide 8 Application Programming
Sierra Wireless, Inc. 8-2
Device drivers
The DART 200 requires no special device drivers. Serial
communications port support provided by the PC Operating System is all
that is needed. For modem setup any ASCII terminal emulator, such as
Terminal, Hyperterminal, Procomm, Kermit, and so on, is appropriate.
For applications use the normal communications port I/O commands
supported by the programming language you use.
Application program structure
A CDPD application is similar in general structure to most network
based applications. It consists of the following major sections:
DART setup
This is usually done before the DART 200 is put into use, or as a special,
first time only function of the application. The needs of the application
and the terminal are evaluated based on the protocol being used (TCP,
UDP, or SLIP mode) and the appropriate options are chosen. Refer to
Chapter 5, DART Supported Protocols, for modem setup samples.
Network connection
Establishing a network connection involves, enabling the Personal
Identification Number (PIN) (if used), registering the modem with the
network (if not set up to register automatically), then establishing the
communication session with a peer device, as follows:
1. If PINs are used, issue the PIN enabling command (AT*E) before
attempting to access the network.
2. For application use (as opposed to testing), set up the modem
registration as fully automatic, by setting the Registration time-out
S-Register to 0
( ATS13=0), then issue an AT\R4 command, as
described in Automatic registration, p. 8-6. Save your changes with
an AT&W.
This causes the DART 200 to automatically register at power up, and
when registration is dropped, for example, due to a power failure or
driving out of the coverage area.
3. A session is established for a client by dialing (ATDn command) to
establish a logical connection with another device (TCP), or to set up
the target device’s IP Address and port for insertion into the data
packets to follow (UDP). Refer to the D command in Appendix F,
DART AT Command Set, for more information.