BASIC OPERATIONS
QuickCarrier
®
USB-D MTD-MVW1 User Guide
25
Using Command Mode and Online Data Mode
Modems have two operation modes, command and online data. When you power up the modem it is in command
mode and ready to accept AT commands.
Use AT commands to communicate with and configure your modem. They allow you to establish, read, and modify
device parameters and control how the modem works. The device can also generate responses to AT commands
that help determine the modem’s current state.
If the modem is in online data mode, it only accepts the Escape command (+++).
To send the modem AT Commands from terminal emulation software, set the software to match the modem’s
default data format, which is:
Speed: 115,200 bps
Data bits: 8
Parity: none
Stop bit: 1
Flow control: hardware
To confirm you are communicating with the device:
Type
AT
and press
Enter
.
If the device responds with OK, you are communicating with the device.
Disconnecting a Data Connection Using Host IP Stack
Issue the following command to disconnect:
AT#SGACT-1,0
.
Verifying Signal Strength
To verify the device signal strength, enter:
AT+CSQ
The command indicates signal quality, in the form:
+CSQ: <rssi>,<rsrq>
Where:
<rssi>
Received signal strength indication.
0
(-113) dBm or less
1
(-111) dBm
2-30
(-109) dBm - (-53) dBm / 2 dBm per step
31
(-51) dBm or greater
99
Not known or not detectable
