Command
Response
Description
▶
Set/read reference value for level/depth measurement
aXAC<value>!
aXAC!
attt1<CR><LF>
a<value><CR><LF>
Set reference value
Read reference value
a
– sensor address
<value>
–
pbbbb.eee
1)
Input/output without leading zeros!
Value range: –9999.999 … +9999.999
Factory setting = +0.000
With this command, you can establish, for example, a refer-
ence to a level zero point during level measurement by
entering a reference value. After setting the reference value,
the OTT PLS 500 automatically starts a measurement. Then
check the measured value with the
aD0!
command.
Caution
This command overwrites a possibly set offset value!
Example
Measured value= +2.100 m
Reference value = +1.500 m
Output = +1.500 m
(Offset calculated by the OTT PLS 500 and applied to all
other measured values = +0.600 m)
Notes
– A subsequent change of the unit (
aXSU<value>!
) may
result in rounding errors of ±0.001.
– If the unit of level measurement is set to pressure values
(
aXSU<value>!
), a measurement is already active or
an error has occured, the OTT PLS 500 does not respond.
▶
Reset/read all units to default (metric or imperial)
aXSR<value>!
aXSR!
a<value><CR><LF>
a<value><CR><LF>
Reset units to default
Read default units
a
– sensor address
<value>
– +0: metric
+1: imperial
+2: individual customer setting
(only for reading)
This command resets all – potentially individually changed –
units to metric or imperial values (according to the delivery
state). The factory setting depends on the ordered variant
code.
▶
Reset pressure probe to factory settings without communication settings
aXSF!
a<CR><LF>
Reset pressure probe
a
– sensor address
Resets all settings to factory values (delivery state according
to the ordered variant code).
Individually changed communication settings on the
RS-485 interface (Modbus, SDI-12) remain unchanged.
RS-485 protocol
➝
unchanged
Units
➝
default metric or imperial
1)
depending on the set unit; extended command
aXSU<value>!
36
