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Cellular Phone Compatibility Modem AT Commands

Cellular Phone Compatibility

Usinganalogcellularphonestocommunicatewithameterequippedwitha

modemisnotrecommendedduetotheinherentunreliabilityofcellularphone

communication.However,ifcellularphone‐to‐metercommunicationis

necessary,werecommendthefollowingsetup:

For compatibility with the (newer) Multi-Tech internal modem:

 Localmode m:Mu lti ‐Tech5600ZDXorGVC56K(alsopossiblewithother

Conexantchipsetbasedmodems)

 NecessaryATcommands:+MS=11,1,1200,4800\N2

 Description:Thissetupforcesv.34atmaximum4800baudandforceserror

correct io n. ThisalsoensuresotherATcommandsdonotturnofferror

correctio nandcompression.The4800settingmay beincreasedto7200/ 960 0, 

butinmostcases,using4800resultsinbetterthroughputduetolesserrorsfor

themode mstodealwith.

Fortheaboveapplication,thefollowingarerecommendedmodeminitialization

stringchangesfortheMulti‐Techmodem(insidetheIONmeter):

ATcommand:S10=100

Description:Increasesdisconnecttimeonlossofcarrier

ATcommand:B1

Description:Ifratedropsto1200,useBellprotocol

For compatibility with the (older) Conexant internal modem:

 Localmode m:BlackBoxMiniModem56kData/Faxmodem,modelMD1620 A, 

orMulti‐TechMultiModem,modelMT5600ZDX

 NecessaryATcommands:%E0‐K1‐SEC=1+MS=10,1,1200,9 600

 Description:Thissetupallowsthemodemtonegotiate anybaudratebetween

1200and9600bps.Thissetupalsopreventsv.34connectionsbynotallowing

themode m tonegotiateanythinghigherthanV32bis.

Fortheaboveapplication,thefollowingarerecommendedmodeminitialization

stringchangesfortheConexantmodem(insidethe

IONmeter):

ATcommand:AT%E0‐K1‐SEC=1+MS=10,1,1200,9600

Inaddition,themodemsiteneedstobesetupasfollows,regardlessoftheactual

connectionbaudrate:

 ModemType:BlackBoxMiniModem56kData/F ax

 TransmitDelay:10ms

 BaudRate:9600bps

 RTS/CTS:unchecked

 ReceiveTimeout:5000ms

 ByteTimeout: 20byte‐time

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