Sierra Wireless DART 200 CDPD Modem User Manual

Page 159

DART 200 CDPD Modem User’s Guide

F DART AT Command Set

PN1197-00 Revision 1.0

F-15

Table F-3. Commands beginning with backslash (\) (cont.)

\N
(cont.)

Format:

AT\N2

B side only

AT\N3

A side preferred (default)

AT\N4

B side preferred

Choose \N3 or \N4 only if the modem is used in a visiting (traveling) application

Result codes:
OK

Valid argument

ERROR

Invalid argument

Select PAD or Telnet Operating Mode

Allows the user to select Packet Assembler/Disassembler (PAD) mode, or telnet mode for modem
operations. Refer to PAD operating mode, p. 8-25, for more information.

Telnet mode logs on a user to a remote host by emulating an ASCII terminal. A telnet session uses TCP
protocol but generates additional packets both during session initiation (when terminal emulation
parameters are being negotiated), and during operation (when host echo is usually used).

PAD mode is used to communicate with specific applications or devices using TCP or UDP and usually
have less overhead than telnet. It also supports binary mode data transfers that telnet does not.

NOTE:
Telnet mode is not appropriate for telemetry applications.

To facilitate telnet setup several related profile parameters are forced by the AT\O command as follows:

\O1

Select telnet mode (default)

Use remote echo when in online mode

\M0

Disable manual data forwarding

\T1

Enable automatic data forwarding

\O0

Select PAD mode

Use local echo while in online mode

\M1

Enable manual data forwarding

\T0

Disable automatic data forwarding

Format:

AT\O0

Select PAD mode

AT\O1

Select TELNET mode (default)

Result codes:

Valid argument

ERROR

Invalid argument