Multi-Tech Systems MTD-EVe manual Verifying Signal Strength, At+Csq

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BASIC OPERATIONS

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.

Verifying Signal Strength

To verify the device signal strength, enter:

AT+CSQ

The command indicates signal quality, in the form: +CSQ: <rssi>,<ber>

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

<ber>

Bit error rate, in percent

0

Less than 0.2%

1

0.2% to 0.4%

2

0.4% to 0.8%

3

0.8% to 1.6%

4

1.6% to 3.2%

5

3.2% to 6.4%

6

6.4% to 12.8%

7

More than 12.8%

99

Not known or not detectable

QuickCarrierTM USB-D EV-DO MTD-EV3 User Guide

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Contents QuickCarrierTM USB-D EV-DO QuickCarrierTM USB-D EV-DO MTD-EV3 User Guide Contents EMC, Safety, and R&TTE Directive Compliance Documentation MTD-EV3 SpecificationsProduct Overview OverviewSMS Dimensions Link Status LEDTurning the Device On or Off Power DrawSécurité relative aux appareils à radiofréquence RF Safety Notices and WarningsGeneral Safety Radio Frequency RF SafetyPotential interference Device MaintenancePrecautions for pacemaker wearers Interference with Pacemakers and Other Medical DevicesUser Responsibility Activation and Carrier Specific Information Account Activation for Cellular Devices Device Phone NumberCreating a Windows Dial-Up Connection Create a PPP Connection Using LinuxShell Commands Testing Serial PortsQuickCarrierTM USB-D EV-DO MTD-EV3 User Guide Related Documentation Using Command Mode and Online Data ModeBasic Operations Interacting with Your Device OverviewAT+CSQ Verifying Signal StrengthSending Text Messages Checking Network RegistrationReading, Writing, and Deleting Messages Reading Text MessagesSend the message. Enter CTRL+Z Deleting MessagesIndustry Canada Class B Notice EMC, Safety, and R&TTE Directive ComplianceRegulatory Statements CFR Part 15 Regulation Class B DevicesOther Countries International Modem RestrictionsEnvironmental Notices Waste Electrical and Electronic Equipment StatementWeee Directive Restriction of the Use of Hazardous Substances RoHS Reach Statement Registration of SubstancesSubstances of Very High Concern Svhc PBB 成分名称 Chinese hazardous substances IndexText messages Verify communication