Rev 3.0B Feb.08
42
6
6: Data Communication and Host
Modes
•
•
The
Raven
‐
E
plays
the
part
of
a
HOST
when
a
computer
or
another
device
is
connected
directly
to
its
port
and
routes
data
to/from
the
connected
device
to
the
cellular
network.
Caution: The Raven-E moves data from one port to the cellular
network in a simple one-to-one routing. It does not employ a routing
table or any complicated routing protocol.
Tip: If you need to have one-to-many routing, you can connect the
Raven-E to a router. The router would provide the multiple routing and
the Raven-E would provide one-to-one for the router to the cellular
network and the Internet.
As
the
host,
the
Raven
‐
E
can
use
different
communication
modes:
Basic Modes
•
AT
:
The
Raven
‐
E
accepts
and
responds
to
standard
AT
commands.
•
PassThru
:
Direct
connection
to
internal
hardware
(OEM
Module)
of
the
Raven
‐
E.
•
Telnet
:
The
Raven
‐
E
auto
‐
answers
TCP
connections
to
allow
terminal
emulation
using
either
a
local
Ethernet
connection
or
remotely
using
the
cellular
connection.
Tip: By default, the Raven-E is in AT Mode and allows AT Commands
to be entered via terminal connection (through the local port
connection) or remotely (through the cellular network). PassThru
Mode can only be exited by resetting the Raven-E. All serial modes
are entered by use of a startup mode command.
Data Communication
•
Public
and
Private
Modes
:
The
method
used
by
the
Raven
‐
E
to
pass
an
IP
address
to
a
connected
device.
•
Keepalive
:
How
the
Raven
‐
E
maintains
its
connection
to
the
cellular
network.
