Serial Communication Modes - Airlink101 G3210 User Manual

Raven and PinPoint GPRS User Guide Version 1.50

6. Serial Communication Modes

In this section the following terminology is used:
Host:
Modem:
OEM
Modem:
Server:
An AirLink modem can be in one of six serial communication modes with the
attached Host:
AT:
PPP:
PassThru:
UDP PAD:
TCP PAD:
SLIP:
The default mode is AT command. If the modem is in any of the other modes, the AT
command mode can be re-entered by:
The PassThru mode can only be exited by resetting the modem
The modem can be programmed to enter one of the other modes automatically on
power up. This is done setting the Startup Mode Default (MD) to the desired mode.
If this setting is non-zero, the modem will enter the specified mode after 5 seconds. If
you want to cancel this behavior, the ATMD0 command can be used before the 5-
second timeout expires.
The modes are described in more detail in the following sections.
AirLink Communications, Inc.
This is the computer or terminal that is attached to the serial port of
the Raven. Also known as the DTE.
The Raven. The DCE to the host.
The embedded communications transceiver module.
A computer to which a Raven is communicating wirelessly.
The modem accepts and responds to standard, Hayes-style AT
commands. This is the default.
Modem is using PPP to communicate with the Host.
Direct connection to internal OEM Module.
Any data received on the serial port is assembled into UDP packets
and send to the session's associated IP and Port (described later).
Any responses received from the associated IP and port destined for
the modem's Device Port are unwrapped and sent out the serial
port.
Any data received on the serial port is packaged into TCP messages
and sent to the associated connection's IP and Port (described
later). Any data received from the TCP peer is unwrapped and sent
out the serial port.
Modem is using SLIP to communicate with the Host.
• Deactivating DTR (if &D2 or Ignore DTR, S211, is not set)
• Issuing the +++ escape sequence (if Disable AT Escape, DAE, is
not set)
•
Resetting or Power cycling the modem.
Page 16 April 28, 2005