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7.2
NMEA PROTOCOL (RS-232)
NMEA protocol is based on the standard protocol family widely used by navigation equipment.
NMEA protocol is sentence oriented and can send multiple sentences with different information.
The sentence content is designated by the starting keyword which is different for each sentence
type. NMEA sentences are terminated with the checksum which makes this protocol extremely
reliable. NMEA protocol is unidirectional: data is only transmitted from the level meter.
At RS-232 interface the device periodically outputs following data sentences:
7.2.1
LEVEL MEASUREMENT REPORT
$LVX,L1,L2,T1,L3,L4,S1 <CR><LF> firmware versions up to 2.3.2
$LVX,L1,L2,T1,L3,L4,S1,S2<CR><LF> firmware versions greater than 2.3.2
$LVX:
The keyword sent in the beginning of each detection report. This sentence is sent
whenever here is detected level.
L1:
The actual distance between the instrument and the water surface, as measured by
the instrument.
L2:
The average distance between the instrument and the water surface, as measured
by the instrument. This value is calculated by applying the averaging filter to the data
measurements. Filter parameters can be adjusted using the Instrument Configurator
application under device Settings.
T1:
The internal temperature of the instrument.
L3:
The actual water level measured by the instrument. The measured water level
depends on the measured distance between the instrument and the water surface,
and on the predefined instrument offset which can be adjusted using the Instrument
Configurator application under device Settings.
L4:
The average water level measured by the instrument. The measured water level
depends on the measured distance between the instrument and the water surface,
and on predefined instrument offset which can be adjusted under device Settings.
The measured water level is filtered using averaging filer, to smooth the measured
data. Filter parameters can be adjusted using the Instrument Configurator
application under device Settings.
S1:
Signal to Noise Ratio of the detected signal. SNR is the difference between signal
level corresponding to measured distance and the noise floor level. Low SNR levels
indicate that the measured value may be inaccurate.
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