Operating Instructions

6.2 Standard commands
Command Response Description
a! a<CR><LF>
Acknowledgement active
a – Sensor address; factory setting = 0
aI! allccccccccmmmmmm…
…vvvxxxxxx<CR><LF>
Send identification
a – Sensor address
ll – SDI-12-protocol version
cccccccc – Manufacturer identification (company name)
mmmmmm – Sensor designation
vvv – Sensor version (here firmware version)
xxxxxx – Additional designation (here serial number)
OTT SVR 100 response = 013OTT SVR100485xxxxxx
aAb! b<CR><LF>
Change sensor address
a – Old sensor address
b – New sensor address
?
!
a
<CR><LF>
Query sensor address
a – Sensor address
aM! atttn<CR><LF>
Start measurement
a – Sensor address
ttt – Time in seconds until sensor has determined
measured result
OTT SVR 100 response = 000 seconds
n – Number of measured values
OTT SVR 100 response = 6
aD0!
a<value1><value2><value3> …
… <value4><value5><value6> …
… <CR><LF>
Send data (after aM!)
a – Sensor address
<value1> – Average flow velocity
(floating mean over approx. 30 seconds)
Measured value format:
+b.eeee … pbb.eee [m/s]
1)
+b.bbbb … pbbbb.e [cm/s]
1)
+b.bbbb … pbb.eee [ft/s]
1)
<value2> – Current flow velocity:
Measured value format:
+b.eeee … pbb.eee [m/s]
1)
+b.bbbb … pbbbb.e [cm/s]
1)
+b.bbbb … pbb.eee [ft/s]
1)
<value3> – Sensor tilt angle to horizontal
Meausred value format: +bbb [°]
<value4> – Flow direction
Format: pb [1]
–1 = Away from sensor
+1 = Toward sensor
If the flow direction filter is deactivated
(aOSD0!) this value shows the relevant flow
direction for the measured flow velocity; if the
filter is activated the value is fixed at the corre-
sponding filter setting
(e.g. aOSD2! ➝ –1).
<value5> – Signal quality index
Format: +00b [1]
+000 = Excellent signal quality
+001 = Good signal quality
+002 = Poor signal quality
➝ impaired measured values
+003 = Very poor signal quality;
➝ unacceptable measured values
1)
depending on the set unit (advanced command aOSU<value>!)
18