Basic Operations; Interacting With Your Device Overview; Related Documentation; Before You Begin - Multitech QuickCarrier USB-D EV-DO MTD-EV3 User Manual

BASIC OPERATIONS

Basic Operations

Interacting with Your Device Overview

This section describes how to use AT commands to interact with your device. Using terminal software such as
Kermit, you can issue AT commands to communicate with and configure your modem. The AT commands let you
establish, read and modify device parameters and help you control how the device operates. This section
documents basic interactions with your device, such as verifying signal strength and network registrations, sending
and reading SMS text messages, and sending and receiving data.
Generally, USB modems are used as unintelligent bit pipes. In Windows, this means you create a dial-up network
connection that uses the Windows IP stack to use the modem to create a PPP connection to the cellular network.
The modem is assigned an IP address from the cellular carrier. This connection provides Internet access and is the
basis for TCP/IP communication for sending and receiving email, creating TCP/UDP Sockets, or putting and getting
files from an FTP server.
In Linux, PPPD is used to dial the modem and create the connection to the cellular TCP/IP network. This provides
Internet access for sending and receiving email, creating TCP/UDP Sockets, or putting and getting files from an FTP
server.

Related Documentation

Related documentation for using EV-DO EV3 devices:
■
EV-DO EV3 AT Commands Reference Guide (S000546) provides for additional information on AT commands
available for your device. The Introduction chapter describes command formatting, syntax, and other basic
information.

Before You Begin

Before you begin:
■
If you have not done so, install any drivers. Refer to the separate driver installation guide for your device.
■ Power up your device and ensure it is connected to the computer that you use to issue AT commands.
■
Install terminal software that can communicate with the device, such as HyperTerminal, TerraTerm, Kermit,
or Putty.

Preparing the Modem for a Data Connection

Set the APN by issuing the following command where <APN Name> is the APN assigned by the carrier.
■
AT+CGDCONT=1,"IP","<APN Name>
Check for registration by issuing AT+CREG?<cr> and wait for the response. If the second value of the response (for
example, +CREG:x,y) is 1, then the modem is registered on the home network. If y=5, then the modem is registered
but roaming. See the AT Command reference guide for other possible responses. If the second value is not 1 or 5,
then do not attempt to dial. Wait ~5 seconds for the modem to finish registration and check +CREG again.

Using the Radio IP Stack to Make a Data Connection

Connect by issuing the command: AT#SGACT=1,1 (using PDP context #1).
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QuickCarrier USB-D EV-DO MTD-EV3 User Guide