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2110212 Rev 1.0 Page 53
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.