Vaisala DPT146 Guide de l'utilisateur télécharger pdf (Page 49)

Chapter 5 _________________________________________________________________ Operation

VAISALA ________________________________________________________________________ 47

Select Unit

Use the UNIT command to select metric or non-metric output units.

UNIT [x]<cr>

where

Selects the unit type to output:

m = metric units, for example

, Celsius

n = nonmetric units, for example, Fahrenheit

Example:

unit m

Units : Metric

Configuring Serial Line Operation

Set Serial Line Operating Mode

Use the SMODE command to set the start-up operating mode of the

serial line.

SMODE [mode]<cr>

where

mode

STOP, RUN, POLL, or MODBUS.

Table 9 Selection of Output Modes

Mode

Measurement Output

Available Commands

STOP

Only with the SEND command.

All (default mode).

RUN

Automatic output.

Only command S.

POLL

Only with the SEND [addr]

command.

SEND [addr] and OPEN [addr].

Other commands available after

opening a line to the transmitter

using the OPEN command.

Use with RS-485 buses where

multiple transmitters can share

the same line.

MODBUS

Must be read from the

transmitter using Modbus

protocol.

Modbus protocol only; see

Appendix A, Modbus Reference

on page 66.

If the Modbus mode is activated, serial port commands cannot be used

with the device. To access the serial port command interface, follow the

procedure in Accessing Serial Port Command Interface from Modbus

Mode on page 51.

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Vaisala DPT146 Guide de l'utilisateur Page 49

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