LT-3100 User & Installation Manual Rev. 1.06 System Services
Lars Thrane A/S www.thrane.eu Page 68 of 155
Data (Modem Data, SMS and SBD)
The LT-3100 System is supporting a serial asynchronous automatic dialing and control interface (V250). The
interface makes it possible for external equipment (DTE) to use the Iridium 2.4 kbps Modem Data (Direct
Internet, RUDICS and SBD) service. Also, the Iridium SMS service is available over this serial interface.
The Modem Data ‘Direct Internet’ service is used for Dial-up Networking, whereas the Modem Data
‘RUDICS’ service is commonly used for Iridium Service Providers e.g. to support Email programs.
The LT-3110 Control Unit offers a virtual serial RS-232 interface (DCE) supporting data, control, and status
signals. The serial interface is based on the Telnet Com Port Control Option network protocol (RFC 2217)
and is available at the Ethernet (LAN) interface (RJ45 connector).
Access to the serial interface from a PC requires a virtual COM (or tty) port driver supporting RFC 2217 e.g.,
the Serial Port Redirector (from Fabulatech) on Windows and ttynvt on Mac and Linux. The virtual COM (or
tty) port might be used directly by applications running on the PC (e.g., Email applications) or by the
operating system to establish a dial-up connection to the Internet (dial-up networking).
The serial interface can be accessed by connecting to the IP address (port 5020) of the LT-3110 Control
Unit. The IP address can be read out from the MENU -> System -> Network, see System Submenus, System
on page 88. The serial interface is by default disabled and must be activated from the built-in web server,
see Web server, Data on page 114.
NOTE: The serial interface (port 5020) must be enabled from the LT-3100 System built-in web
server to be available by any external application, see Web server, Data on page 114. By
default, port 5020 is blocked by the built-in LT-3110 Control Unit Firewall.
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