User Guide

Iridium Communications Inc. Information Contained in this Guide
9602 SBD Transceiver Product Developers Guide is Subject to Change Without Notice
Revision 1.2 (DRAFT 2)
Iridium Communications Inc. Distribution of Guide Restricted
Proprietary & Confidential Information 26 to Product Developers Only
Notes:
1. 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).
2. If the DC input to the modem is to be disconnected, the developer will need to “tri-state” the serial
interface to prevent a possible latch-up condition.
3.3.2 Configuration Settings
The 9602/9602N 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 9602/9602N power-up through
use of the AT&Yn command. The 9602/9602N 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 and are detailed further in the “ISU AT
Command Reference”.
3.3.3 Modes of Operation
The serial interface is always in one of three modes: command mode, SBD data mode or SBD session
mode. When the data port is in command mode, AT commands can be entered to control the
9602/9602N. In command mode, flow control has no effect, with the RTS input ignored and the CTS
output driven ON (low). When in SBD data mode, the 9602/9602N is transferring binary or text SBD
message data to or from the DTE.
In SBD data mode:
• All characters from the DTE not forming part of the message data are ignored (i.e. no AT
commands may be entered)
• No unsolicited result codes are issued.
• RTS/CTS flow control, if enabled, is active. When RTS is OFF (high), the 9602/9602N suspends
transfer of data to the DTE; when CTS is OFF (high), the 9602/9602N expects the DTE to suspend
transfer of data to the 9602/9602N.
When in SBD session mode, the 9602/9602N is attempting to conduct an SBD session with the network.
In SBD session mode:
• The DTE must wait for the +SBDI [X][A]session result code.
• All characters from the DTE are ignored.
• Unsolicited result codes are issued where those codes have been enabled.
Transitions between the modes of operation are performed automatically by the 9602/9602N in response
to the SBD AT Commands; the DTE has no other control over the mode.