Multitech MTCBA-G-F2 Manual de usuario descargar pdf (Pagina 55)

Appendix B – Detailed Examples

Multi-Tech Systems, Inc. AT Commands for Wireless Modems with IP Connectivity (S000333D) 55

Connecting to an Internet Service Provider (ISP)

through GSM Data

This example shows how to initiate a GSM data communication from the modem connecting to an ISP.

Description: The attached equipment can initiate an Internet connection, via the modem configured in GSM mode

(GPRSMODE parameter), by sending the 'AT#CONNECTIONSTART' command over the serial port.

Upon receiving this command, the modem automatically attempts to complete a PPP connection

session according to the relevant stored parameters. This is achieved by the modem which dials the

required ISP phone number as predefined in the DIALSELECT parameter.

Once the PPP link is established, the software sends the ISP-assigned dynamic IP address and the

‘Ok_Info_Ppp’ message as a response code to the attached equipment via the serial port. The modem

will then wait for commands from the attached equipment.

Syntax: AT#CONNECTIONSTART

Related Parameters:

Registration on the network

AT+ command

The product has to be registered on the GSM network

AT+ CREG=1

GSM mode

Deactivate the GPRS mode to switch in the GSM mode.

AT#GPRSMODE=0

ISP Primary Number

Primary dial-up phone number to connect with the required local ISP.

AT#DIALN1

ISP Secondary Number

Secondary dial-up phone number to connect with the required local ISP.

AT#DIALN2

Dial Option

The value of this parameter determines which of the two numbers detailed above (i.e.

DIALN1 or DIALN2) is used to establish an Internet connection: the primary dial-up

number or the secondary dial-up number.

AT#DIALSELECT

ISP User Name

User name / login of the ISP account.

AT#ISPUN

ISP User Password

Password for ISP account.

AT#ISPPW

Number of call retries

Indicates how many unsuccessful connection attempts the software will make before

terminating the connection attempt activity.

AT#REDIALCOUNT

Delay between call retries

Controls the delay (in seconds), if any, that will be introduced between each call retry if

the call is not successful.

AT#REDIALDELAY

Stop the AT#CONNECTION

START process

The ‘AT#CONNECTIONSTART’ process can be stopped by sending the

‘AT#CONNECTIONSTOP’ command over the serial port

AT#CONNECTIONSTOP

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