User's Manual

Iridium Satellite LLC

9601 SBD Transceiver Preliminary Product Developers Guide

V1.2 082905

Iridium Satellite LLC Proprietary & Confidential Information

Information contained herein is preliminary and subject to change without further notice

Note that the Ring Indicator (RI) pin is used by the 9601 Transceiver to indicate that a Mobile Terminated

SBD (MT-SBD) message is queued at the Gateway. The Field Application will need to monitor this pin

and use appropriate AT Commands to command the Transceiver to retrieve the MT-SBD message.

The serial interface may be operated with a 3-wire connection, where only transmit, receive and ground

signals are used. However the 9 wire interface offers better control and is the recommended

implementation. Iridium is only able to provide limited 3-wire interface support. When operating with a 3-

wire connection, the following rules apply:

 AT&Dn must be set to AT&D0 to ignore the DTR input

 AT&Kn must be set to AT&K0 to disable RTS/CTS flow control

 The other output signals may be connected, and operate as follows:

 CTS driven ON (low)

 DSR operates as normal

 RI operates as normal

 DCD driven ON (low)

Note: RTS/CTS flow control, when enabled, is only used when the data port is in SBD data mode. In AT

command mode, RTS is ignored and CTS is driven ON (low).

3.3.2 Configuration Settings

The Data Module allows the DTE to configure the data port communication parameters. The three

configuration types are active, factory default, and stored. The active configuration is the set of

parameters currently in use. They can be changed by the DTE individually via specific AT commands.

The factory default configuration is stored in permanent memory. This configuration can be recalled at

any time through use of the AT&Fn command.

Two groups of settings, or “profiles”, can be stored as user-defined configurations. The DTE first creates

desired active configurations and then writes them to memory using the AT&Wn command. These

profiles can be designated to be loaded as the active configuration upon Data Module power-up through

use of the AT&Yn command. The Data Module can be reset without loss of power to these profiles

through use of the ATZn command.

The configuration settings are stored in “S-register” locations.