CHAPTER 5________________________________________________________________ COMMANDS
VAISALA _________________________________________________________________________ 43
Output modes
The output modes only affect output through the serial interface: the
transmitter accepts all display and LED commands irrespective of
which serial output mode it is in. The DMP248 transmitter has three
serial output modes: RUN, STOP and POLL.
In the RUN state the transmitter outputs measurements automatically
through the serial interface to a PC or a peripheral. The only command
that can be given through the serial interface is S (stop) which ends
the RUN state.
In the STOP state serial commands are given to the transmitters.
Measurements are then output only by entering command SEND.
The POLL state is used when more than one transmitter is connected
to the same serial bus; a single transmitter can be addressed and
communicated with. When the connection to the one transmitter is
opened in the POLL state, the transmitter goes into STOP state and
can then receive commands normally. Closing the connection returns
the transmitter to POLL state. In POLL state the transmitter outputs
measurement only when requested (with command SEND, see page
51). If the user has forgotten the address of the transmitter and the
transmitter does not have a display, the transmitter has to be reverted
to the factory settings. If the transmitter has a display, the settings can
be checked through it.
Setting the serial interface operation mode
• Select Mode in the main menu; the following is displayed:
• Select Serial output:
• The currently valid setting flashes. Select the desired mode with
the arrow keys and press ENT. After this the programme returns to
the Mode Menu.
• When Run mode is selected, the currently valid output interval is
displayed:
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