Murata Electronics North America 910M Manual Do Utilizador

WIT910

responsibility of the user application. Refer to the Protocol Commands section for
complete details.

2.3. Modes of Operation

2.3.1. Control and Data Modes

The WIT910 has two modes of operation: Control mode and Data mode. When in
Control Mode, the various radio and modem parameters can be modified. When in Data
Mode, only data can be transmitted. The default mode is Data Mode. There are two
ways to enter Control Mode. The first way is to assert the Configure (CFG) pin on the
modem. Upon entering Control Mode, the modem will respond with a > prompt. After
each command is entered, the modem will again respond with a > prompt. As long as the
CFG pin is asserted, data sent to the modem will be interpreted as command data. Once
the CFG pin is de-asserted, the modem will return to Data Mode.

The second method for entering Control Mode is to send the escape sequence

:wit2410

(all lower case) followed by a carriage return. In the default mode, the escape sequence is
only valid immediately after power up or after de-assertion of the Sleep pin on the
modem. The modem will respond in the same way with a

prompt. To return to Data

Mode, enter the Exit Modem Control Mode command,

z>,

or assert and de-assert the

Sleep pin. There are three modes for the escape sequence, controlled by the Set Escape
Sequence Mode command,

zc = 0

Escape sequence disabled

zc = 1

Escape sequence available once at startup (default setting)

zc = 2

Escape sequence available at any time

The

zc2

mode setting is useful if the user application has a need to change the modem

settings "on the fly". In this mode the escape sequence is always enabled and may be sent
at any time after a pause of at least 20ms. The modem will respond in the same way as
when in the default mode. It is necessary to issue the Exit Modem Control Mode
command,

, before resuming data transmission.

Note: The escape sequence must be interpreted as data until the last character is received

and as such may be transmitted by the modem to any listening modems.

2.3.2. Sleep Mode

To save power consumption for intermittent transmit applications, the WIT910 supports a
Sleep Mode. Sleep Mode is entered by asserting the Sleep pin on the modem interface.
While in Sleep Mode, the modem consumes less than 250 µA. This mode allows the
radio to be powered off while the terminal device remains powered. After leaving Sleep
Mode, the radio must re-synchronize with the base station and re-register.

M-0910-0000 Rev -