User Manual

GM862-GPS Software User Guide

1vv0300729 Rev. 5 - 05/07/07

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

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