Reference Guide

2
Rev 2.8.1 Feb.11 17
2: Supported GSM / WCDMA AT
Commands
ThischapteridentifiestheITU‐TRecommendationV.250,
3GPPTS27.005,and3GPPTS27.007ATcommandsthatare
supportedonregularandvoice‐enabledSierraWireless
modems(AirCard,Compass,andMiniCard).These
commandsareusedto:
• Controlserialcommunicationsoveranasynchronous
interface(ITU‐TRecommendationV. 2 5 0 )
• ControlSMSfunctionsfordevicesonGSM/WCDMA
networks(3GPPTS27.005)
• ControldevicesoperatingonGSM/WCDMAnetworks
(3GPPTS27.007)
TheITU‐Tspecification,SerialAsynchronousDiallingand
Control(RecommendationV.250),isavailableontheInternational
TelecommunicationUnionwebsite,
www.itu.int,andthe
3GPPspecificationdocuments,3GPPTS27.007V3.1 3.0(2003‐
03)and3GPPTS27.007V3.13.0(2003‐03),areavailableonthe
3GPPwebsite,
www.3gpp.org.
Thetablesbelow identifywhethereachcommandissupported
onAirCardmodems,Compassmodems,andMiniCard
embeddedmodules.An“N/A”intheSupportedcolumnofthe
tableindicatesthatthecommandisrelatedtoafeature(such
asvoice)thatisnotavailableonthemodems.
Somecommandsarepartiallysupported—thedescriptionsfor
thesecommandsidentifyanylimitationsoncommandusage.
Also,somecommandsaredescribedinmoredetailinlater
chapters—thedescriptionsforthesecommandslinktothose
detailedentries(forexample,&Vin
Table2‐1).
Table 2-1: Supported ITU-T Recommendation V.250 AT commands
Command Description Supported
&C Set Data Carrier Detected (Received line signal detector) function
mode
No
&D Set Data Terminal Ready function mode No
&F Set all current parameters to manufacturer’s defaults Yes
&S Set DSR signal No
&T Auto tests No
&V Return operating mode AT configuration parameters Yes