Intelimax LITE User Manual
V1.1
18
Circuit Switch Data Call – Serial Modem Mode
Circuit switch is a legacy style of communications where the user dials in to the modem
data terminating number.
Set of AT commands used with Circuit Switch Call
ATD
Dial the Data number
ATA
Answer the Data Call
ATS0=n
Set auto answer where n=number of rings
+++
Escape command to enter AT command mode
ATH
Drops the data call
AT&D
Set the DTR line
To use this feature please ensure the following has been setup on the SIM:
1.
Contact SIM service provider and make sure that CSD is activated on the Sim
card. Generally this requires a second number (data terminating number)
attached to the same service.
2.
Configure the modem to auto answer the call or make sure that the equipment
connect to the modem has auto answer activated to detect an incoming call
and sends ATA to answer the data call.
IP Stack Auto Mode
When using IP STACK Auto mode the modem will behave as an IP Serial modem, the
modem will packetise all incoming data via the serial port and transfer to the host and
vice versa.
Intelimax LITE IPStack can be configured as a Server or Client mode. In Server mode the
Intelimax LITE will act as a socket server. The modem will listen on a specific TCP/UDP
port waiting for an incoming client socket connection. As soon as the client drops the
socket connection, the Intelimax LITE will go back to socket listening mode as per IP
stack configuration. On the other hand with client mode the Intelimax LITE will try to
establish a socket connection to a preconfigured server IP address or DNS name and
port number. The client mode also supports a secondary server IP address just in case
the primary server cannot be reached. The in-built IP stack feature supports features
such as PPP link check, TCP link check, PPP link timeout, TCP link timeout and MTU
settings.
