Vaisala PTB220 - Manual (Page 93)

A PPENDIX E ___________________________________________________________ A NALOG OUTPUT
V AISALA _________________________________________________________________________ 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
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
Analog output : 4 ... 20 mA
>
>amode 0
Analog output : 0 ... 5 V
>
ASCL
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.