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TECHNICAL NOTE
Modem AT Commands
This technical note outlines compatible AT commands that may be used with ION
meters equipped with the internal modem option. AT commands control a
modem’s operation and are useful for setting up the modem (for example, if you
want to turn off the modem’s autoanswer feature). All AT commands begin with
the characters AT, which is short for “attention code”. This is what alerts the
modem that a command is following immediately.
CAUTION
Adding, removing or changing AT commands should only be performed by qualified individuals. Putting
improper code in the modem configuration string could cause the modem to become inoperable.
Depending on the ION meter and its date of manufacture, the installed optional
internal modem could be one of two different brands. The Conexant modem is the
older type modem, and is available in North American (FCC approved) or
European (CTR-21 compliant) versions. The newer modem is manufactured by
Multi-Tech and is a universal modem that can be readily used in most countries,
and complies with FCC, Industry Canada and TBR-21 regulations.
Contained in this document is a section explaining how you can determine which
type of modem is installed on your ION meter, a section that lists AT command
sets for the new (Multi-Tech) modem, and a section that lists AT command sets for
the older (Conexant) modems.
In This Document
ION Meter Internal Modem Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
Multi-Tech Modems in ION Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
Multi-Tech Internal Modem Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
AT Commands for the Multi-Tech Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
S-Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Conexant Modems in ION Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
AT Commands for the Conexant Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Changing the Internal Modem Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Changing the Local Modem Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Cellular Phone Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289