Sierra Wireless DART 200 CDPD Modem manual AT command set summary, ∙ AT E1 V1 &D0 &S1 \F3 \N2

DART 200 CDPD Modem User’s Guide 1 Introduction

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NOTE:

Either the M-ES or F-ES can initiate CDPD communication.

3.Data packets are routed by the MDIS through the appropriate network to the Fixed End System (F-ES), usually a host computer over a public or private data network.

4.If a response is required from the F-ES, the process is reversed. The role of the DART 200 in the CDPD network is to:

1.Accept commands and digital data from the end-user application equipment through the RS-232 port.

2.Assemble the data into packets.

3.Encrypt the packets.

4.Transmit the encrypted data packet to the network.

The DART 200 also:

1.Receives packet data from the network.

2.Decrypts the packets.

3.Disassembles the packets to extract the application data.

4.Passes the serial data to the end-user’s application equipment through the RS-232 port.

Airlink security, to prevent eavesdropping, is provided by encrypting the data packets between the DART 200 and the MDIS. If end-to-end data security is desired it must be implemented or otherwise provided by the end-user.

The major cellular carriers and equipment manufacturers created a trade group called the Wireless Data Forum (formerly the CDPD Forum), that develops and publishes the governing technical specifications for, and promotes the use of CDPD technology.

AT command set summary

The Basic and Service Provider AT command sets are listed in Tables

1-1 and 1-2 (pp. 1-5 and 1-6). The AT commands can be concatenated (end-to-end or with a blank between commands) for up to a length of 80 characters including blanks, for example:

∙Normal command concatenation

∙ATE1V1&D0&S1\F3\N2

∙AT\S?S57?&V+

∙White space concatenation (for readability)

∙AT E1 V1 &D0 &S1 \F3 \N2

Sierra Wireless, Inc. 1-4