Siemens M1 - Manual (Page 67)

66
gsm-m1-e.fm GSM M1 Module, English: A24859-N4000-A100-1-7677
Technical reference section
26.2.96
S14: Command echo, result codes
Bit Options Values
0 Reserved 0
1 Command echo (ATEn) 0
1 Echo off
Echo on
2 Result codes (ATQn) 0
1 Display result codes
Suppress result codes
3 Short format mode (ATVn) 0
1 Result codes as digits
Result codes as text
4 Reserved 0
5 Reserved 0
6 Reserved 0
7 Reserved 0
S21: DTR and DCD options
Bit Options Values
0 Reserved 0
1 Automatic dialing when
DTR OFF -> ON (At%Dn) 0
1 Automatic DTR dialing on
Automatic DTR dialing off
2 Reserved 0
3
4
DTR options (AT&Dn)
0
1
2
3
Ignore DTR
GSM module changes to command
mode when it detects falling edge at
DTR (ON -> OFF)
Same as 1 but also disconnects call.
GSM module is initialized when it
detects falling edge at DTR
(ON -> OFF)
5 DCD options (AT&Cn)
0
1 DCD always ON
DCD with valid carrier
6 Reserved 0
7 Reserved 0