Data communication and host modes, Basic modes data communication – Sierra Raven EDGE User Manual
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Rev 3.0B Feb.08
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6
6: Data Communication and Host
Modes
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The Raven 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 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 to a router. The router would provide the multiple routing and
the Raven would provide one-to-one for the router to the cellular
network and the Internet.
As the host, the Raven can use different communication
modes:
Basic Modes
•
AT: The Raven accepts and responds to standard AT
commands.
•
PassThru: Direct connection to internal hardware (OEM
Module) of the Raven.
•
Telnet: The Raven 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 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. All serial modes are
entered by use of a startup mode command.
Data Communication
•
Public and Private Modes: The method used by the Raven
to pass an IP address to a connected device.
•
Keepalive: How the Raven maintains its connection to the
cellular network.