User guide

Raven EDGE/GPRS for Cingular - User Guide, version 2.31 21
Data Communication and Host Modes
AT Mode
Using a terminal connection, AT commands are used to configure the modem, command it to do
something, or query a setting. For a full listing of the AT commands, refer to page 50. Wireless
Ace is a graphical user interfac
e for most AT Commands.
AT commands must always be terminated by <CR> (ASCII character 0x0D),
a carriage re
turn
(pressing enter on the keyboard). Some may also include a new line or line feed <LF>.
If E=1 (Echo On),
the AT command (including the terminating <carriage return) will be dis-
played (output) before any responses.
Two settings affect the format of AT command output: V (Verbose) and Q (Quiet).
The serial port of the Raven can be configured to
enter any of the modes automatically on power
up (in most cases, this is also after it has registered on the cellular network). This is done by set-
ting the Startup Mode Default (refer to MD i
n the AT Command listing, page 87) 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 time-out
expires.
FIGURE 1. Wireless Ace: MD
If the Raven is in any mode other than AT or PassThru, the A
T command mode can be re-entered
by:
• 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.
Note: DTR needs to be asserted (S211=1 or &D0) by the host before PPP Mode,
SLIP Mode, UDP PAD Mode, or TCP PAD Mode can be entered.