Vaisala HMP243 Guide de l'utilisateur télécharger pdf (Page 33)

HMP240 series

M210300en User's Guide

5.3.5.4 Selecting the output units

• Select Unit in the main menu:

• Use the arrow keys to select the right alternative and press ENT.

metric non-metric

RH %RH %RH

T °C °F

Td °C °F

°C °F

a g/m

gr/ft

x g/kg gr/lb

Tw °C °F

5.3.5.5 Selecting the calculation mode

Disconnect the security lock jumper!

• Select More and then again More in the second menu:

• Select Frost and then the desired alternative with the arrow keys;

FROST ON (default) for frostpoint and FROST OFF for dewpoint

calculation at dewpoint temperatures below 0 °C.

5.3.6 Output modes

The output modes only affect output through the serial interface: the transmit-

ter accepts all display and LED commands irrespective of which serial output

mode it is in. The HMP240 transmitter has three serial output modes: RUN,

STOP and POLL.

In the RUN mode 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 mode.

In the STOP mode serial commands are given to the transmitter. Measure-

ments are then output only by entering command SEND.

The POLL mode is used when more than one transmitter is connected to the

same serial bus; a single transmitter can be addressed and communicated with.

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Vaisala HMP243 Guide de l'utilisateur Page 33