Multitech MTCMR-E1 Specifications download pdf (Page 14)

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14 Multi‐TechSystems,Inc.MultiModemCellUserGuide

Chapter 3 – Using the Wireless Modem

UsingATCommandstoVerifySignalStrengthandRoaming

Status

YoucanuseATcommandstooperate,configure,andqueryyourmodem.ReferenceguidesdocumenttheATcommands.

YoucandownloadtheseguidesfromtheMulti‐Techwebsite.

Toverifysignalstrengthandroamingstatus,youmustuseaterminalapplicationsuchasHyperTerminal.Toopenthis

programinWindowsXP,gotoStart>AllPr

ograms>Accessories>Communications>HyperTerminal.OtherWindows

operatingsystemshavesimilarpathstoHyperTerminal.Seeyoursystem’sonlineHelpifyoucannotfindHyperTerminal.

VerifyingSignalStrength

Toverifysignalstrength:

1. Openaterminalprogramofyourchoosing.

2. TypeAT+CSQ

Themodemrespondswiththereceivedsignalstrength(rssi)andthechannelbiterrorrate(ber).

RSSIrangesfrom0to31.

SignalStrengthVerification– RSSI

AT+CSQxxValues SignalStrength

0‐10 WeakorInsufficient

11‐20 Average

21

–

31 Exceptional

99 Nosignal

BERrangesfrom0to7(Sevenisthehighesterrorrate).

CheckingNetworkRegistrationandRoamingStatus

ToverifythattheMultiModemisregisteredonthewirelessnetwork:

1. OpenHyperTerminal.

2. TypeAT+CREG?

Themodemrespondsinoneofthefollowingways:

NetworkRegistrationVerification

Value NetworkRegistrationStatus

0,0 Themodemisnotregisteredonanynetwork

Ifnotregistered,verifythesignalstrength.Thereceivedsignalmight

notbestrongenoughforthemodemtoregister.

0,1 Themodemisregisteredonthehomenetwork.

0,5 Themodemisregisteredonanetworkanditisroaming.

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Multitech MTCMR-E1 Specifications Page 14