Remote Communications
FS22 SI
A4249-8.0
HBM: public
67
:ACQUisition:WAVElength:CONTinuous:NTPSync:STARt
Continuous acquisition of wavelengths of all the channels of
the interrogator. This command is sent via port 3500 and
corresponding data is received through port 3365. The
received data is in binary format and contains information on
Timestamp, Wavelength values of all sensors from all optical
channels with the following structure:
1)
Fixed Header (30 bytes) [always sent independently of the
payload content (even without sensors)]:
a)
2 bytes (sync “#0”)
b)
4 bytes (remaining header length 24 bytes + payload
length)
c)
8 bytes (timestamp):
i)
LWORD1: seconds since 1.1.1970
ii)
LWORD2: fraction of current second mapped to
an integer range of 32 bit (i.e. 0.5 s would corre
spond to ½*2^32)
d)
2 bytes #sensors CH0 + 2 bytes #sensors CH1 +
2 bytes #sensors CH2 + 2 bytes #sensors CH3 +
2 bytes #sensors CH4 + 2 bytes #sensors CH5 +
2 bytes #sensors CH6 + 2 bytes #sensors CH7
2)
Payload:
a)
Payload on interrogator with 1 optical channel:
4 bytes CH0/wvl0 + 4 bytes CH0/wvl1 + (…)
b)
Payload on interrogator with 4 optical channels:
4 bytes CH0/wvl0 + 4 bytes CH0/wvl1 + (…) +
CH3/wvl0 + CH3/wvl1 + (…)
c)
Payload on interrogator with 8 optical channels:
4 bytes CH0/wvl0 + 4 bytes CH0/wvl1 + (…) +
CH7/wvl0 + CH7/wvl1 + (…)
with wavelengths in ascending order [wvl0 < wvl1 < (…) ].
Содержание FS22 SI
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Страница 22: ...Operation 22 A4249 8 0 HBM public FS22 SI Fig 3 6...
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