Sierra Wireless DART 200 CDPD Modem - Manual (Page 155)

DART 200 CDPD Modem User’s Guide F DART AT Command Set
PN1197-00 Revision 1.0 F-11
Table F-2. Commands beginning with ampersand (&) (cont.)
&L Set DART Line Speed and Format
For serial ports, this command allows the Mobile Application Subsystem (MAS) to set the line speed
and format. All subsequent communications between the MAS and the DART is at the new speed and
format if the command completes successfully. These settings do not survive a modem power cycle
unless saved with an &W.
The serial port interface to the MAS is configured to the line speed (300, 1200, 2400, 4800, 9600, or
19200), data bits per character (7 or 8), parity (O, E, N) and number of stop bits (1 or 2) specified. If
any of these are invalid none of the settings are changed.
Regardless of the interface speed selected, the airlink speed is still 19200.
The modems default is 9600, 8N1 with autobaud active.
NOTE:
Executing this command disables the modem’s autobaud feature. This is desirable for most
applications. However, autobaud can be reactivated if desired with the AT&L1 command.
Format:
AT&L<s>,<bps> Deactivate autobaud feature and set the modem as specified
• s = desired line speed
• b = number of data bits (7 or 8)
•
p = parity (O for odd, E for even, N for none)
•
s = number of stop bits (1 or 2)
Examples: AT&L9600,8N1
AT&L19200,7E1
AT&L1 Reactivate autobaud feature
Result codes:
OK Valid argument
ERROR Invalid argument
&S Set DSR Operation
For serial ports, this command defines the operation of the data set ready signal (DSR) at the DART’s
RS-232 interface. This signal can then be tested by the MAS application to determine if the specified
condition is true. Refer to Chapter 8, Application Programming, Data and control interface, for more
information.
Format:
AT&S0 DSR is always active (default)
AT&S1 DSR follows the state of the Connection
AT&S2 DSR follows the state of RF in Range
AT&S3 DSR follows the state of Registration
Result codes:
OK Valid argument
ERROR Invalid argument