218 • SMP Gateway User Manual
In the right pane, choose a modem pool in the drop-down list for each modem.
This will add the modem to the modem pool.
Edit the modem settings for each modem (see following table).
In the left pane, click Asynchronous Serial Ports.
In the right pane, edit the serial port settings for each modem.
The meaning of each modem setting is given below:
Setting Description
AT Init String This AT string is sent to the serial port to initialize the modem. It should
be a valid AT string to which the modem will respond with an OK.
Default value: ATZ
AT Off-Hook String This AT string is sent to the modem to answer the call when a RING
message is received. The modem must, therefore, be configured to NOT
auto-answer the calls (avoid S0=X, where X is other than 0).
Default value: ATA
AT Dial String This AT string is prefixed to the phone number and sent to the modem to
make outgoing calls.
Default value: ATDT
AT On-Hook String This AT string is sent to the modem to hang up. After a call has been
completed, the “AT Init String” is always sent to reinitialize the modem.
Default value: ATH0
Incoming Only Put a checkmark if you want the modem to receive incoming calls but
not be able to make outgoing calls. If you do not put a checkmark, the
modem will be able to make and receive calls.
Allowed values: checkmark / no checkmark
Default value: no checkmark
AT Response Timeout Specifies how much time the modem pool will wait for an answer to an
AT string command. There is an exception for the ATDT and ATA
commands, since it can take some time to synchronize the carriers and
complete the call. For these exceptions, the maximum time is set to 3
minutes.
The timeout value depends on the modem and more specifically, on the
response time required for the +++ and ATH commands.
Range: 0 to 60,000 ms
Default value: 5,000 ms
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