Vaisala PTB220 Series Guide de l'utilisateur télécharger pdf (Page 93)

APPENDIX E ___________________________________________________________ ANALOG OUTPUT

VAISALA _________________________________________________________________________ 87

APPENDIX E ANALOG OUTPUT

The optional analog output module has two selectable operating

modes: current (4...20mA) and voltage (0...5V). There are four

additional serial commands in use for operating the barometer having

the analog output module.

NOTE

The lower end of voltage output range is not exactly 0V but ~3mV

NOTE

The dip switch SW3 has to be ON when there is the analog output

module installed in the PTB220 series barometer.

AMODE x <cr>

where:

x = 0 (voltage output mode) or 1 (current output mode)

The operating mode can be changed by using the command AMODE.

Plain command AMODE without 0/1 shows the operating mode in

use.

Examples of selecting analog output mode:

>amode 1<cr>

Analog output : 4 ... 20 mA

>amode 0<cr>

Analog output:0...5V

ASCL <cr>

The ASCL command is used to scale the pressure range of the analog

output module. The software requests a lower and an upper pressure

limit. The lower pressure limit corresponds to 4mA or 0V and the

upper limit to 20mA or 5V.

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Vaisala PTB220 Series Guide de l'utilisateur Page 93