M7/M7L/M7LT Modular Satellite Modem
Maintenance
M7/M7L/M7LT - Rev. 0.05
3-85
3.7.15. Setting the Modem Address for Command Mode Operation
If Command Mode Binary Packet Operation is desired the modem packet “address” must be set via
the front panel before the modem will recognize packets. To activate Binary Packet RS-485 remote
control and set the address, navigate to the
<Unit: Remote
– RS-485 Mode>
parameter and set to
‘Full Access’. Then navigate to the
<Unit: Remote
– RS-485 Protocol>
and set to ‘Binary Packet’.
Then navigate to the
<Unit: Remote
– RS-485 Address>
and use the numeric keypad to enter the
address from 0 to 255. Then press the “Enter” key to enable the change.
The address 255 is “global” and all units will respond to a message packet with this address
regardless of its setting, but no unit will return a response message. It is suggested that you do not
use addresses 1 or 255 (1 is the factory setting, and any new unit added to a system will have
address 1).
The address “0” is also unique. This address causes the modem to accept commands and send
responses without the address fields normally required in the command packets.
3.8.
Data Interface Options - Technical Details
3.8.1.
I7
– Advanced IP Interface
The I7 IP interface uses a sophisticated processor consisting of an x86 based embedded computer
on a module which is plugged into the interface card. The module is referred to here as a “Q7”
because it follows a computer interface standard know as Q-seven. The Q7 is a complete x86 based
embedded Linux computer including multiple interfaces. The interface board with Q7 module is
housed entirely within the M7 (I7) series of Datum Systems satellite modems.
The purpose of the I7 with Q7 processor is to act as an interface between IP Ethernet networks and
satellite modems as part of point-to-point or point-to-multipoint data transfer. The I7 is not a fixed
dumb interface, it is a full sophisticated router class device and therefore requires configuration.
The purpose of this section is to introduce the IP interface cards that use the Q7 processor based
platform for routing and bridging. Detailing the full capabilities of these IP cards is beyond the scope
of this section. Our goal here instead is to:
1. Introduce you to this card,
2. Show initial set up the or I7 IP addresses allowing access for full configuration,
3. Show a few initial Vyatta configuration methods.
4. Show command line methods of modem control from these cards.
3.8.1.1.
More about the Q7 Processor Cards
The Q7 Linux software starts life as a standard Vyatta Router which normally contains virtually all of a
standard Debian OS overlaid with the Vyatta Router system. We modify both Debian and Vyatta for
this application and also add modifications to support the M7 series of modems. The Vyatta Router
provides an industry standard open source and very consistent router facility. The modem
modifications consists of changes to the Linux/Debian drivers to support our custom embedded board
and modem interface plus some changes to the Vyatta system and finally added programs
specifically intended for monitor and control of the specific host modem. Everything added except
some tweaks to the underlying kernel to aid in reboot is accomplished by standard Debian packages
and the installed “apt” package management system. Users of Linux and Vyatta should feel
comfortable in this environment while users standard routers should also adapt very quickly.
The Q7-IP provides the following features:
Powerful x86 Atom processor based. Up to 1.6 GHz and dual virtual processors.
Robust Debian Linux Operating System
– currently modified Debian “Squeeze”.
Industry Standard Vyatta Router overlay on Linux for IOS/JunOS like control. One major
advantage of Vyatta is that it provides a clean single point configuration interface and saved
configuration file.
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