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PinPoint EDGE/GPRS - User Guide, version 2.32 20
CHAPTER 5 Data Communication and Host Modes
The PinPoint plays the part of a HOST when a computer or another device is connected to its
serial or Ethernet port. The PinPoint can also route data to/from the connected device to the cellu-
lar network.
Note: The PinPoint 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. If you need to have one-to-many routing, you can connect the
PinPoint to
a router. The router would provide the multiple routing and the PinPoint would
provide one-to-one for the router to the cellular network and the Internet.
As the host, the PinPoint can use different communication modes.
AT: The PinPoint accepts and responds to standard AT commands.
PassThru: Direct connection to internal hardware (OEM Module) of the PinPoint.
Telnet: The PinPoint auto-answers TCP connections to allow terminal emulation using the cellu-
lar connection.
PPP Mode: The PinPoint uses PPP to communicate with a device or computer connected to the
serial port.
SLIP Mode: The PinPoint uses SLIP to communicate with a device or computer connected to the
serial port.
UDP and UDP PAD: Any data received on the serial port is assembled into UDP packets and sent
to the session’s associated IP address and Port (described later). Any responses received from the
associated IP address and port destined for the modem's Device Port are unwrapped and sent out
the serial port.
TCP and TCP PAD: Any data received on the serial port is packaged into TCP messages and
sent to the associated connection’s IP address and Port (described later). Any data received from
the TCP peer is unwrapped and sent out the serial port.
By default, the PinPoint is in AT Mode and allows AT Commands to be entered via terminal con-
nection (through the local port connection) or remotely (through the cellular network). PassThru
Mode can only be exited by resetting the PinPoint. All other modes are entered by use of a startup
mode command.