α
2 Simple Application Controllers
AL2-GSM-CAB 8
ENG-42
*1 In Siemens M20T case, these settings are not necessary because they are default
settings. If using other GSM Modem, maybe these settings are necessary.
b) Timing to initialize the modem during system startup
In the
α
2 series, there is a function to delay the transmission of the modem command
(AT command) to initialize the modem from the main unit at start up. The delay can
range from 0 - 10 seconds. This command can be useful to ensure the AT command is
correctly transmitted when the
α
2 series start up is faster than the modem start up.
Further information for the modem operation can be found in the
α
2 Programming
Manual and the
α
Software Manual.
Table 8.5: AT Command for GSM Modem
Setting Item Set content
Example Setting
M20T
Enable command echo Echo mode OFF E0
Set number of ring before
automatically answering the call
Enable automatic answering on the ring
twice
S0=2
Set circuit data set ready (DSR)
function mode
DSR always ON &S0
Set TE-TA local data flow control
• Specifies the method which will be used
by TE when data is received fromTA:
None
• Specifies the method which will be used
by TA when data is received from TE:
None
+IFC=0,0
Report mobile equipment error Enable result code and use numeric value +CMEE=1
Set fixed local rate Baud Rate: 9600 bps +IPR=9600
Set circuit data carrier detect
(DCD) function mode
*1
DCD line is ON only in the presence of
Data Carrier
&C1
Select bearer service type
*1
9600 bps (V.32), asynchronous modem,
non-transparent
+CBST=7,0,1
Store current parameter to use
defined profile
The user profile is stored in non-volatile
memory
&W
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