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Rev 3.0B Feb.08 43
6
6: Data Communication and Host
Modes
• Basic Modes
• Data Communication
TheRavenplaysthepartofaHOSTwhenacomputeror
anotherdeviceisconnecteddirectlytoitsportandroutesdata
to/fromtheconnecteddevicetothecellularnetwork.
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.
Asthehost,theRavencanusedifferentcommunication
modes:
Basic Modes
• AT:TheRavenacceptsandrespondstostandardAT
commands.
• PassThru:Directconnectiontointernalhardware(OEM
Module)oftheRaven.
• Telnet:TheRavenauto‐answersTCPconnectionstoallow
terminalemulationusingeitheralocalEthernet
connectionorremotelyusingthecellularconnection.
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
• PublicandPrivateModes:ThemethodusedbytheRaven
topassanIPaddresstoaconnecteddevice.
• Keepalive:HowtheRavenmaintainsitsconnectiontothe
cellularnetwork.