Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 35 23.06.2010
Parameter
<value> 0 TA ignores status on DTR
1 ON->OFF on DTR: Change to Command mode with
remaining the connected call
2 ON->OFF on DTR: Disconnect call, change to
Command mode. During state DTR = OFF is
auto-answer off.
Reference
V.25ter
Note
2.2.30 AT&F Factory Defined Configuration
AT&F Factory Defined Configuration
Response
TA sets all current parameters to the manufacturer defined profile.
OK
Execution
Command
AT&F[<value>]
Parameter
<value> 0 set all TA parameters to manufacturer defaults.
Reference
V.25ter
Note
Parameter impacted by &F command:
Command Parameter name Default value
ATE <echo> 0x01
ATQ <result> 0x00
ATV <format> 0x01
ATX <result> 0x04
AT+IFC <TA_by_TE> 0x00
AT+IFC <TE_by_TA> 0x00
ATS0 <num> 0x00
ATS3 <char> 0x0D
ATS4 <char> 0x0A
ATS5 <char> 0x08
ATS7 <time> 0x64
ATS8 <time> 0x02
ATS10 <time> 0x0E
AT+CRLP <ver> 0x00
AT+CRLP <T4> 0x07
AT+CRLP <iws> 0x61
AT+CRLP <mws> 0x61
AT+CRLP <T1> 0x48