Command
Response
Description
aC2!
atttnn<CR><LF>
Start concurrent measurement (simultaneous measurement
with multiple sensors on one single bus line); for deteails, see
command
aM2!
. The number of measured values in the
response to this command has two digits:
nn
=
09
.
aCC2!
atttnn<CR><LF>
Start concurrent measurement (simultaneous measurement
with multiple sensors on one single bus line) and request CRC
(Cyclic Redundancy Check); for details, see command
aM2!
.
The number of measured values in the response to this com-
mand has two digits:
nn
=
09
. The response to the following
aD0!
…
aD2!
command is extended by a CRC value:
a<valueX><valueX><valueX>
…
…
<CRC><CR><LF>
aR2!
a<value1><value2><value3>
…
…
<value4><value5><value6>
…
…
<value7><value8><CR><LF>
The OTT PLS 500 continuously measures level/pressure and
temperature and determines meta data. This command per-
mits to retrieve measurement results even without the combina-
tion of commands
aM2!
/
aD0!
…
aD2!
; for details, see
command
aD0!
…
aD2!
after
aM2!
.
Requires measurement type "continuous measurement";
extended command
aXXC<value>!
aRC2!
a<value1><value2><value3>
…
…
<value4><value5><value6>
…
…
<value7><value8>
…
<CRC><CR><LF>
The OTT PLS 500 continuously measures level/pressure and
temperature, determines meta data and requests a CRC
value (Cyclic Redundancy Check). This command permits to
retrieve measurement results even without the combination of
commands
aM2!
/
aD0!
…
aD2!
; for details, see command
aD0!
…
aD2!
after
aM2!
. Requires measurement type
"continuous measurement"; extended command
aXXC<value>!
aHA!
atttnnn<CR><LF>
Start "High volume" measurement in ASCII format and
request CRC (Cyclic Redundancy Check)
a
– sensor address
ttt
– time in seconds until the sensor has determined
the measurement result
response OTT PLS 500: 0/1 … 60 seconds
1)
nnn
– number of measured values
response OTT PLS 500:
18
aD0!
a<value1><value2><value3>
…
…
<value4><value5><value6>
…
…
<value7><value8><value9>
…
…
<CRC><CR><LF>
Send data (after
aHA!
)
a
– sensor address
<value1>
– last single measured value "level/pressure"
within the averaging time
2) 3)
<value2>
– temperature value of pressure sensor
2)
<value3>
– temperature value of the precision temperature
sensor
2)
<value4>
– mean of measured values "level/pressure"
within the averaging time
2) 3))
<value5>
– minimum of measured values "level/pressure"
within the averaging time
2) 3)
<value6>
– maximum of measured values "level/pressure"
within the averaging time
2) 3)
<value7>
– median of measured values "level/pressure"
within the averaging time
2) 3))
<value8>
– standard deviation of measured values
"level/pressure" within the averaging time
2) 3))
<value9>
– relative humidity in the probe housing
measured value format:
pbb.ee
[
% rH
]
<CRC>
– CRC value
1)
depending on the set averaging time; extended command
aXXM<value>!
In the measurement type "continuous measurement" the time is always 0 seconds (with the exception of the first interval after the start)!
2)
for measured value formats see
aD0!
after
aM!
(depending on the set unit)
3)
determinded from 2 … 238 single measurements of a measurement interval (see command
aXXC!
)
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