Product Information - Iridium Satellite Modem (Discontinued)
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A3LA-D Modem
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Manual, Version Date: May, 2008  Manual

General Description

This satellite modem is designed to work with the Iridium network. Similar to a standard land-line modem, the A3LA-D can be controlled by any data terminal equipment capable of sending AT commands via a serial port.

The Iridium Satellite System used with Campbell Scientific consists of the modem, data/power kit, data cables and antennae. The base station utilizes the standard A3LA-D modem, whereas the remote station utilizes a modified version of this modem called the A3LA-MPT. The A3LA-MPT is a modification produced by NAL Research of Manassas, Virginia which keeps the modem "awake" at the remote site if power is cycled.

Power/Data kits are required to connect the modem to the datalogger or computer and an appropriate power source. For remote applications the SYN-DC-936R converter is used to power the modem from a 9-36 VDC power source. The converter has a DB25 female connector, a DB9 serial cable connector, and two power leads with ring connectors. 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. This can be accomplished using an external relay (C1701) activated through the control ports on the datalogger.

In some remote applications it may be beneficial to use Campbell Scientific's Terminal Strip Expander.

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