Chapter 2 – Dialing Services
Multi-Tech Systems, Inc. AT Commands for Wireless Modems with IP Connectivity (S000333D)
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#CONNECTIONSTART Start Communication
Definition:
This command directs the TCP/IP stack to originate an outgoing call.
Upon receiving this command, the TCP/IP stack attempts to complete a connection session according
to the GPRSMODE parameter, selecting the GSM or GPRS mode.
•
In GSM mode, the TCP/IP stack will dial the number according to the Dial Option parameter
(DIALN1 or DIALN2 depending on DIALSELECT). If an error occurs, the TCP/IP stack
automatically re-attempts the call origination attempt, according to the REDIALCOUNT
parameter. Once the physical layer is up, the TCP/IP stack runs the applicable protocol as
specified in the PPPMODE parameter.
•
In GPRS mode, the TCP/IP stack will establish a GPRS session with the APN using APNUN,
APNPW, GPRSCID parameters. Once the GPRS link is up, the product is connected to the
Internet. The AT#CONNECTIONSTOP command closes the GSM or GPRS connection by
going on hook.
Values:
Read Parameters for GSM Mode:
DIALN1
DIALN2
DIALSELECT
ISPPW
ISPUN
REDIALCOUNT
REDIALDELAY
If PPPMODE set to 2 or 4:
PPPMYIP
PPPPEERIP
PPPSERVPW
PPPSERVUN
For GPRS Mode:
APNPW
APNSERV
APNUN
GPRSCID
Syntax:
AT#CONNECTIONSTART
Command (GSM Mode)
Possible Responses
AT#CONNECTIONSTART
Note: Request connection to GSM
network
DIALING
Note: Phone line is available
2124560123
Note: Dial DIALN1 or DIALN2 number depending on
DIALSELECT
CONNECT 9600
Note: Modem speed negotiated between both sides. If the
TCP/IP stack is configured for modem only operation
(PPPMODE parameter), there are no more return codes
213.192.200.4
Note: IP address attributed to the TCP/IP stack
OK_Info_PPP
Note: As soon as the TCP/IP stack software displays this
message, it is ready to receive commands
AT#CONNECTIONSTART BUSY
Note: A busy signal is detected on the remote site
TCP/IP stack will wait REDIALDELAY seconds then dial again.
The redialing will continue until success or until the number of
call retries defined in parameter REDIALCOUNT has been
reached.