User guide

1
9522B & COM9522B Iridium Data Modem
1. Overview
1.1 General Description and Modes of Operation
The Iridium satellite network consists of a constellation of 66 satellites situated in six
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 we will discuss dial-up data and RUDICS as the preferred methods of
connecting with Campbell Scientific dataloggers. Contact Campbell Scientific if you
wish to send SBD messages as this is possible under datalogger program control.
1.2 Modem Models and Accessories
The Iridium Satellite System used with Campbell Scientific consists of the 9522B
modem, COM9522B Interface Module kit, 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 to dataloggers, when possible is
via the RS232 port. It is possible to communication with a datalogger via either the
CSI/O port or COM Ports 1-4. All datalogger connections will require appropriate
cabling and interface accessories (See Table 1).
The COM9522B is 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 supplied. 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 7 of this manual for information about checking signal quality.
The antenna mounts to a ¾” diameter pipe which can be connected to a horizontal
arm using a nu-rail connector. The nu-rail connector used will depend on the type of
horizontal pipe. 008158 is suitable for the CM200 series arms.