Sierra Wireless DART 300 manual Advanced Features, Multiple Cdpd Accounts

7.Advanced Features

This section covers capabilities of the modem that are rarely used in telemetry applications but may be of interest to some users. There is also additional detail on the modem’s process of channel acquisition and CDPD registration.

The DART 300 modem is based on the Sierra Wireless SB300 module. This module is designed for general CDPD wireless data applications and therefore provides a wide range of features beyond those needed for most telemetry applications.

7.1. Multiple CDPD Accounts

As discussed in Section 3.2 above, the modem must be activated on a CDPD service by acquiring a Network Entity Identifier (NEI). The modem can store up to four NEIs. This is intended to support mobile systems that may use different CDPD providers in different geographic areas. For fixed-location telemetry applications, there is rarely a need for more than one NEI entry.

Details

Any one of the four can be the active NEI entry. The active entry is the one on which most NEI related commands act. It can be different from the auto-register NEI or a currently registered NEI. The active NEI is indicated by an index pointer stored in register +WS197.

Although it is recommended, it is not necessary to de-register from the CDPD network before making changes to the table. If you alter the NEI entry that is currently registered, the modem will de-register the old value. If auto-register is enabled, the modem will then attempt to register the new one.

NOTE

CDPD credentials are directly associated to the table entries. You cannot re-arrange the NEIs in the table without having your cellular service provider reset credentials for the affected NEI(s).

NOTE

The Channel side preference is shared by all NEI accounts. If different accounts require a different channel side, the side preference may need to be changed when changing the active account.

Implementation

To store the NEI and related CDPD activation parameters using AT Commands enter the following commands (the AT is omitted for brevity):

1.+WPNEILIST to display the NEI table and indicate if one is registered. The auto-register NEI is indicated with an asterisk (*) but the active NEI is not indicated.

2.+WS197=n where n is the entry you wish to edit (1 through 4). This will make it the active NEI. Use 1 for this initial setup test.

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