Rainbow Electronics GM862-GPS - Manual (Page 26)

GM862-GPS Software User Guide
1vv0300729 Rev. 5 - 05/07/07
Reproduction forbidden w ithout Telit Communications S.p.A. w ritten authorization - All Rights Reserved page 26 of 120
2.7 Placing a CSD Data call (not GPRS)
Before a data call can be placed, it is recommended to check if the mobile is registered on a network
(see par. 2.5.3.1) and if the signal strength is enough to ensure that a call can be made (see par.
2.5.3.2).
2.7.1 Data call device set up
2.7.1.1 Set the device in data mode
•
Send command AT+FCLASS=0<cr>
•
wait for OK response
TIP: The +FCLASS setting is maintained in memory, so there's no need to repeat this command
if +FCLASS setting is not changed.
2.7.1.2 Set the desired modulation and speed for the connection
The data connection can be made using different modulations at different speeds.
This connection mode can be selected with the command +CBST. The syntax for the command is:
AT+CBST=<mod>,0,<ce>
These parameters can be selected as seen in the table:
Command Modulation Speed
[bps]
Connection
Element
AT+CBST==0, 0, 1 Autobauding ---- non transparent
AT+CBST==1, 0, 1 V.21 300 non transparent
AT+CBST==2, 0, 1 V.22 1200 non transparent
AT+CBST==3, 0, 1 V.23 1200/75 non transparent
AT+CBST==4, 0, 1 V.22Bis 2400 non transparent
AT+CBST==6, 0, 1 V.32 4800 non transparent
AT+CBST==7, 0, 1 V.32 9600 non transparent
AT+CBST==14, 0, 1 V.34 14400 non transparent
AT+CBST==65, 0, 1 V.110 300 non transparent
AT+CBST==66, 0, 1 V.110 1200 non transparent
AT+CBST==68, 0, 1 V.110 / X.31 2400 non transparent
AT+CBST==70, 0, 1 V.110 / X.31 4800 non transparent
AT+CBST==71, 0, 1 V.110 / X.31 9600 non transparent
AT+CBST==75, 0, 1 V.110 / X.31 14400 non transparent