Sierra Wireless MP 700 Series, Command Reference Manual

Page: 21 / 118

Note: Entering incorrect syntax
or a parameter outside of the
specified range may have
unexpected results.
Modem Basics
Defaults shown in the command tables are those for the
factory settings of the modem. They are
not the defaults
assumed for a command issued without parameters, which are
noted in the text.
Registers
Some registers are read only. Attempting to write to them
yields an
ERROR
result code.
Some registers store the setting of commands. Changing the
register is equivalent to changing the command setting.
The table for S registers indicates the standard default values.
The factory defaults are also noted in a separate sub-section.
Responses and Result Codes
Most commands return only a result code; however, some
commands request information, which is provided by the
modem as a response prior to the result code.
Possible result codes
Result codes are not shown in the command tables unless
special conditions apply. Generally the result code
OK
is
returned when the command has been executed.
ERROR
may
be returned if parameters are out of range, and will be
returned if the command is not recognized, or the command is
not permitted in the current mode, state, or condition of the
modem.
See the table on page 106 for a listing of result codes.
Human vs. machine interface
The AT command interface was designed for human inter­
action. When an intelligent host is managing a modem, the
interface may need to be altered (result code words replaced
with numbers, for example). Framing characters (line feeds
and carriage returns) must be properly understood to ensure
the host system properly parses the responses and result
codes.
As shipped, the modem is configured with these settings:
• Echo enabled (
E1
) causes the modem to echo characters
received from the host back to it while in command state.
The backspace is echoed as
<BS> <space> <BS>
in order to
erase the last character.
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