OTT PLS 500, Operating Instructions Manual

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Command Response Description
▶
Set/read depth measurement measuring mode
aXAA<value>!
aXAA! a<value><CR><LF>
a<value><CR><LF>
Set measuring mode depth measurement
Read measuring mode
a
– sensor address
<value>
– +0 = measuring mode depth deactivated
+1 = measuring mode depth activated
Factory setting:
+0
➝
depth measurement deactivated
▶
Set/read averaging time
aXXM<value>!
aXXM! a<value><CR><LF>
a<value><CR><LF>
Set averaging time
Read averaging time
a – sensor address
<value> – bb.e
Input/output without leading zero!
Value range: 0.5 … 59.5 s
Factory setting: 1.5 s
Note
This command starts a subsequent measurement with the set
averaging time.
▶
Set/read measurement type
aXXC<value>!
aXXC! a<value><CR><LF>
a<value><CR><LF>
Set measurement type
Read measurement type
a – sensor address
<value> – +0: single measurement
+1: continuous measurement, interval mode
+2: continuous measurement, floating mode
Factory setting:
+0
➝
measurement type "single measurement"
An OTT PLS 500 measurement interval is defined as arith-
metic mean of single measurements over an adjustable aver-
aging time. A single measurement takes 250 milliseconds.
The averaging time is 0.5 … 59.5 seconds.
Single measurement: The OTT PLS 500 is in the idle state by
default. An SDI-12 measurement command starts a single
measurement interval over the set averaging time. This mea-
surement type is available in parallel on the SDI-12- and
RS-485 interfaces.
Continuous measurement, interval mode: In interval mode,
single measurements take place continuously one after the
other. The OTT PLS 500 immediately responds to an
aRx!
command with a measured value (with the exception of the
first interval after the start). This value is always updated
after the averaging time has expired. The response to an
aMx!
command indicates the time until the averaging time
has expired and an updated value is available.
1 2 3 4 Single measurement
Measurement interval 1 s
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250 ms 250 ms 250 ms 250 ms
n n+1 n+2 n+3
Measurement interval m: 1 s
250 ms 250 ms 250 ms 250 ms
n+4 n+5 n+6 n+7
Measurement interval m+1: 1 s
250 ms 250 ms 250 ms 250 ms
n n+1 n+2 n+3
250 ms 250 ms 250 ms 250 ms
n+4 n+5 n+6 n+7
250 ms 250 ms 250 ms 250 ms
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1 2 3 4 Single measurement
Measurement interval 1 s
Sta
rt
Me
an
val
ue
250 ms 250 ms 250 ms 250 ms
n n+1 n+2 n+3
Measurement interval m: 1 s
250 ms 250 ms 250 ms 250 ms
n+4 n+5 n+6 n+7
Measurement interval m+1: 1 s
250 ms 250 ms 250 ms 250 ms
n n+1 n+2 n+3
250 ms 250 ms 250 ms 250 ms
n+4 n+5 n+6 n+7
250 ms 250 ms 250 ms 250 ms
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