Sierra Wireless DART 200 CDPD Modem - Manual (Page 115)

DART 200 CDPD Modem User’s Guide 8 Application Programming
PN1197-00 Revision 1.0 8-21
• Verbose Mode (Vn) - Controls whether the DART 200’s command
responses are textual or numeric. The default is enabled (V1). This is
recommended for manual interaction with the DART 200, such as
initial setup. The verbose response consists of a text string preceded
and followed by a <
CR >/< LF >. Terse responses consist of a numeric
response code followed by a < CR > only. Terse responses are
appropriate for application use. For a complete listing of the response
codes, see Messages and response codes, p. 8-25
• Extended Result Codes (Xn) - Determine whether or not all return
codes are enabled. The default is enabled (X1). If disabled (X0), only
return codes 0-4 or corresponding verbose counterparts are enabled.
In that case, return codes of five and above are mapped onto codes 0
to 4 as appropriate. It is generally not desirable to disable this feature
Echo option selection
Echo lets data being keyed in on the keyboard of an ASCII terminal
attached to a computer (either local or remote) appear on the terminal
screen (the computer echoes the characters back to the screen). To speed
up the process, or to reduce wireless data traffic, the echo function can
optionally be done by the modem. The DART 200 provides two echo
options: command mode and online mode.
The default for command mode echo is enabled (E1). This feature causes
all AT commands to be echoed by the modem. This feature is very useful
for manual operation. However, when an application is in command
mode the echoes are a nuisance to be discarded when searching for the
command response; for application use disable this option (E0). In
development using both modes, echo can be enabled by end-users and
application disabled at initialization.
The default for online mode echo is do not echo characters locally (F1).
This implies that the remote device has the option of echoing the online
data stream. The only time this capability is useful and could happen is
during a telnet session. In a typical M-ES to F-ES CDPD transaction or
data transfer application using UDP or TCP, no echoing is needed or
desired. Use the default (F1) to suppress local echoing of the online data
for all applications. If this is not done and online echo is active (F0), all
data sent by the attached device is echoed back to it by the modem that
can complicate application programming; or, in the case of
non-intelligent devices, can cause unpredictable operation.