Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 16 12/24/2010
2 AT Commands According to V.25TER
These AT Commands are designed according to the ITU-T (International Telecommunication
Union, Telecommunication sector) V.25ter document.
2.1 Overview of AT Commands According to V.25TER
Command Description
A/
RE-ISSUES THE LAST COMMAND GIVEN
ATA ANSWER AN INCOMING CALL
ATD MOBILE ORIGINATED CALL TO DIAL A NUMBER
ATD><N> ORIGINATE CALL TO PHONE NUMBER IN CURRENT MEMORY
ATD><STR> ORIGINATE CALL TO PHONE NUMBER IN MEMORY WHICH
CORRESPONDS TO FIELD <STR>
ATD L REDIAL LAST TELEPHONE NUMBER USED
ATE SET COMMAND ECHO MODE
ATH DISCONNECT EXISTING CONNECTION
ATI DISPLAY PRODUCT IDENTIFICATION INFORMATION
ATL SET MONITOR SPEAKER LOUDNESS
ATM SET MONITOR SPEAKER MODE
+++ SWITCH FROM DATA MODE OR PPP ONLINE MODE TO
COMMAND MODE
ATO SWITCH FROM COMMAND MODE TO DATA MODE
ATP SELECT PULSE DIALLING
ATQ SET RESULT CODE PRESENTATION MODE
ATS 0 SET NUMBER OF RINGS BEFORE AUTOMATICALLY
ANSWERING THE CALL
ATS 3 SET COMMAND LINE TERMINATION CHARACTER
ATS 4 SET RESPONSE FORMATTING CHARACTER
ATS 5 SET COMMAND LINE EDITING CHARACTER
ATS 6
PAUSE BEFORE BLIND DIALLING
ATS 7 SET NUMBER OF SECONDS TO WAIT FOR CONNECTION
COMPLETION
ATS 8 SET NUMBER OF SECONDS TO WAIT FOR COMMA DIAL
MODIFIER ENCOUNTERED IN DIAL STRING OF D COMMAND
ATS10 SET DISCONNECT DELAY AFTER INDICATING THE ABSENCE OF
DATA CARRIER
ATT SELECT TONE DIALING
ATV TA RESPONSE FORMAT
ATX SET CONNECT RESULT CODE FORMAT AND MONITOR CALL