Vaisala WXT520 Guide de l'utilisateur télécharger pdf (Page 65)

Chapter 6 ________________________________________________________ Connection Options

VAISALA_______________________________________________________________________ 63

Changing the Communication

Settings (aXU)

Make the desired setting with the following command. Select the

correct value/letter for the setting fields, see Setting Fields on page 61.

See also the examples.

Command format in ASCII and NMEA 0183:

aXU,A=x,M=x,C=x,I=x,B=x,D=x,P=x,S=x,L=x<cr><lf>

Command format in SDI-12:

aXXU,A=x,M=x,C=x,I=x,B=x,D=x,P=x,S=x,L=x!

where

A, M, C, I,

B, D, P, S,L

= The communication setting fields, see Setting Fields

on page 61.

x = Input value for the setting

<cr><lf> = Command terminator in ASCII and NMEA 0183

! = Command terminator in SDI-12

NOTE

When changing the serial interface and communication protocol, note

the following:

Each serial interface requires its specific wiring and/or jumper settings

described in Chapter 5, Wiring and Power Management, on page 43.

Change first the serial interface field C and then the communication

protocol field M.

Changing the serial interface to SDI-12 (C=1) will automatically

change the baud settings to 1200, 7, E, 1 and the communication

protocol to SDI-12 (M=S).

NOTE

Reset the transmitter to validate the changes of communication

parameters by disconnecting the service cable or using the Reset

(aXZ) command, see Reset (aXZ) on page 66.

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Vaisala WXT520 Guide de l'utilisateur Page 65