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Extended AT Commands Manual Page 9 of 70 2009-06-25
1. OVERVIEW
The modem is a rugged, full duplex Data and SMS modem designed to operate on 3G 850MHz
networks. 3G is an efficient and secure cellular wireless technology that compliments fixed or
mobile applications.
The modem incorporates RS-232 and USB drivers, AC/DC down converter.
The modem connects directly to a HOST computer utilizing a RS-232C or USB V1.1 interface. The
Host signals are converted to the RS-232C or USB 1.1 signal levels.
Designed to meet the requirements for global 3G markets, the modem will operate over the
following TX /RX frequency ranges:
Transmit Frequency(MHz) Receiver Frequency(MHz)
850MHz 2100MHz 850MHz 2100MHz
824 ~ 849 1920 ~ 1980 869 ~ 894 2110 ~ 2170
The wide range supply input voltage of 9V to 36V provides compatibility for platforms utilizing a
variety of power sources or battery capacity.
NOTE: Whilst the input supply for the modem is 9–36Vdc, the modem will not power-up at 9 volts. 9.5 volts is required for power-up.
MT2 then remains powered-up until the voltage drops to 9 volts.
1.1. General Description
This manual has been provided to assist users and developers integrate the Maxon with host
equipment and software for current or new applications. We will update the contents when
applicable.
This manual defines the communications interface between host devices to the modem.
Integration with the cellular network is as per the following diagram.
Figure 1-1 Network Integration
Um
RCE
(Remote Customer Equipment)
IWF
X
TE2
(Host)
Rm
(RS232
& USB)
BSC/MSC
MT2
( )