Specifications

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Multi‐TechSystems,Inc.MultiModemiCellUserGuide 34
Chapter 3 – Using Your Wireless Modem
PhoneNumbersfortheWirelessModem
● Everywirelessmodemhasauniquephonenumber.
● Yourwirelessserviceprovidermaygiveyouthephonenumber.ThenumbermaybeontheSIMcard.Wireless
providerimplementationsmayvary.
ExamplesofUsefulATCommands
HyperTerminal
Toverifysignalstrengthandroamingstatus,useaterminalapplicationsuchasHyperTerminal.Toopenthisprogramin
WindowsVistaorXP,gotoStart>AllPrograms>Accessories>Communications>HyperTerminal.OtherWindows
operatingsystemshavesimilarpathstoHyperTerminal.IfyoucannotfindHyperTerminal,useyoursys
tem’sonlineHelpfile.
ATCommands
YoucanuseATcommandstooperate,configure,andqueryyourmodem.ATcommandsfortheMultiModemiCellsare
publishedinseparateReferenceGuides.YoucanfindtheseguidesontheMulti‐Techwebsite.
Thefollowingtwocommandsletyouquerysignalstrengthandroamingstatus.
VerifyingSignalStrength
1. UsingHyperTerminal,typeAT+CSQ
2. Themodemrespondswiththereceivedsignalstrength(rssi).
3. 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 LEDBars
0‐10 WeakorInsufficient 1BarLEDislit
11‐20 Average 1Barand2BarLEDsarelit
21
–
31 Exceptional 1Bar,2Bar,3BarLEDsarelit
99 Nosignal Nolight
BERrangesfrom0to7(Sevenisthehighesterrorrate).
CheckingNetworkRegis
trationandRoamingStatus
ToverifythattheMultiModemisregisteredonthewirelessnetwork:
1. OpenHyperTerminal,andtypeAT+CREG?formostmodels.
ThemodemrespondstoAT+CREG?inoneofthefollowingways:
NetworkRegistrationVerification
Value NetworkRegistrationStatus
0,0 Themodemisnotregisteredonanynetwork
0,1 Themodemisregisteredonthehomenetwork
0,5 Themodemisregisteredonanetworkanditisroaming