Lantronix SCS Reference Manual page 152

Modems
9.3.2.1 Examine the Profile
Display the modem profile by entering the List Port Modem command.
Local>> LIST PORT 3 MODEM
A series of settings will be displayed. For example, the Attention string may be currently set to at, and Error
Correction may be enabled. Read through the configuration options discussed in Typical Modem
Configuration on page 9-13 and determine which options you'll need to enable or disable to meet your
needs. Consult your modem's documentation for the appropriate strings.
9.3.2.2 Edit the Init String
The Init string configures your modem at initialization. This string should do the following:
Command Should
Set the modem to factory defaults.
Set the modem to ignore any character that may force it to
return to command mode (for example, +++).
Set carrier detect (DCD) to "follow carrier."
Set the modem to hang up phone and return to command mode
when the DTR signal is dropped.
Set the modem to use hardware flow control
Set the modem to determine its serial speed from the Attention
command (rather than using a constant serial speed).
Set the modem to return as many result codes as possible
(known as "all progress"). Result codes will be returned in text
rather than numbers.
If desired, set the modem to pass Caller-ID information to the
SCS.
The example strings given in Table 9-1 are not for all modems: consult your
Note:
documentation for appropriate commands.
If the Init string in your profile needs to be edited, use the Define Ports Modem Init command. The
following example uses the example strings from Table 9-1.
Local>> DEFINE PORT 3 MODEM INIT "&fs2=128&c1&d2&k3s20=0w1"
Often, initialization commands are sent individually, prefaced by the modem's Command Prefix string
(commonly "at"). In order for the SCS to correctly send the information to your modem, all commands must
be sent in one string. Do not include the Command Prefix string in the init string.
DSR should always be on.
Note:
Figure 9-3: Displaying Modem Configuration
Table 9-1: Commands in Initialization String
Figure 9-4: Sending Initialization String
9-4
Modem Profiles
Example String
&f
s2=128
&cl
&d2
&k3
s20=0
w1
%ccid=1