Vaisala GMP343 User Manual download pdf (Page 32)

User’s Guide ______________________________________________________________________

30 ___________________________________________________________________M210514EN-E

Operation modes of the GMP343

The GMP343 can operate in three different modes:

- RUN mode

- STOP mode

- POLL mode

In the RUN mode, the GMP343 sends measurement results at regular

intervals. The included parameters and the interval can be set by the user.

While in the RUN mode, the device will not answer any other command

except the S command, which stops the RUN mode and switches the

device to STOP mode.

The STOP mode is the default mode of operation for the GMP343, where

most of the commands listed in this document are available. You can enter

the STOP mode from the RUN mode with the S command, or from the

POLL mode with the OPEN<addr> command, where <addr> is the

unique address of the GMP343. While in the STOP mode, the GMP343

will respond to all unknown commands with the following string:

Unknown command.[cr][lf]>

The POLL mode is dedicated for bus interfacing. To work in the poll

mode, each device must have its own unique address. You can enter the

POLL mode by giving the CLOSE command in the STOP mode.

Only a single device can be accessed at a time in the POLL mode. In the

POLL mode, you can request a single measumement message from the

GMP343 using the SEND<addr> command. While in the POLL mode,

the GMP343 will ignore all unknown commands.

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Vaisala GMP343 User Manual Page 32