Instruction manual

9522B Iridium Satellite Modem
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4
1. Overview
1.1.
General Description and Modes of Operation
The Iridium satellite network consists of a constellation of 66
satellites situated in 6 planes in low-earth orbit. Each plane is
populated by 11 satellites in polar orbits, giving the Iridium
network excellent coverage in high latitudes that equatorial
satellites often cannot reach.
Iridium provides 5 different services: dial-up data, Short Burst
Data (SBD), Short Messaging Service (SMS), Internet
Connection, and Router Based Unrestricted Digital
Internetworking Connectivity Solution (RUDICS). For the
purposes of this manual only dial-up data will be discussed as
this is the preferred method of connecting with Campbell
Scientific dataloggers. However, while other services may not be
directly relevant to datalogger operations, the end user may find
them valuable. Please contact your Iridium service provider with
questions on these methods.
1.2.
Modem Models and Accessories
The Iridium Satellite System used with Campbell Scientific
consists of the modem, data/power kit (C2462), SC932A, data
cables, antenna and power supply. The base and remote
stations utilize the same modem type, which both require a
change to their configuration. The recommended connection of
the remote modem for all dataloggers is via the CS I/O port in a
modem enable configuration.
Warning: It is not recommended to use the null modem cable (i.e.
cable with 2 male connectors) supplied with the C2462 to
make an RS232 connection to the datalogger.
Power/Data kits are required to connect the modem to the
datalogger or computer and an appropriate power source. For
remote applications where AC power is not available it is
recommended to operate the modem on a schedule to avoid
discharging the battery power supply.
The antenna used for both Iridium modems is the SAF5350A
mast mount antenna. For best signal reception the antenna
should be mounted so that it has an unobstructed view of the sky
and horizon. Reception quality changes as satellites move
overhead so it is critical that the view be clear. See Section 4 of
this manual for information about checking signal quality.