VA500 Altimeter Operating Manual
MANUAL-1969127270-2 | issue: 1.3
Page | 13
© 2022
– Valeport Ltd
4.8 Pressure Settings
The pressure sensor fitted to the VA500 measures absolute pressure, i.e. it includes atmospheric
pressure. The pressure tare function allows the atmospheric pressure (as measured by the sensor
before deployment) to be removed from the readings, so the output is simply pressure of water.
Note also that by taking a tare reading at any fixed point in the water column, readings will then be
output relative to that point.
# code
Followed By:
Operation
#009
;<CR> or ;VALUE<CR>
Sets the tare value in systems with pressure
fitted.
;<CR> = Makes device take a reading to use as
tare. ;VALUE<CR> = User entered value in units
as set by #018 command.
#010
<CR>
Returns the tare value
#011
;ON<CR> or ;OFF<CR>
Turns Tare function ON/OFF
#012
<CR>
Reads Tare mode
#016
;Latitude <CR>
Sets Latitude
#017
<CR>
Reads Latitude
#018
;Pressure units<CR>
Set to either
0
– dBar
1
– Metres
2
– Feet
#019
<CR>
Read pressure units
#083
;0 or 1 or 2 or 3
Setup the pressure output format
Where
0=not fitted, 1=PPPP.P, 2=PPP.PP, 3=PP.PPP
#084
<CR>
Returns the set pressure range
4.9 Appended DigiQuartz Data String (VA500P)
The VA500P can be configured to output an additional DigiQuartz type telegram appended to the
conventionally selected and configure telegram. This allows a separate pressure data telegram to
be broadcast to an INS, for example.
This DigiQuartz type telegram contains the instrument pressure reading in PSI, not corrected for
latitude and the tare NOT applied, i.e. PSIA.
In addition, the psia unit can be included in the telegram if required.
These commands are not part of DataLOG x2. You will need to use a Terminal program to
configure the telegram
See section Appended DigiQuartz Telegram (VP500P)
# Code
Followed By
Operation
#042
;0 or ;1
Enable\Disable DigiQuartz output telegram (appended to existing
output)
#043
<CR>
Read DigiQuartz output (on or off)
#044
;0 or ;1
Enable\Disable DigiQuartz units (psia) text appended to DigiQuartz
output telegram
#045
<CR>
Read DigiQuartz units (psia) text appended to DigiQuartz output
telegram (on or off)
