HBK FS22SI, User Manual

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53
FS22SI
REMOTE COMMUNICATIONS
:ACQUisition:ENGIneering:CONTinuous:NTPSync:STARt
Continuous acquisition of engineering data 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, Engi­
neering values of all sensors from all optical channels with the following structure:
3) 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 correspond 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
4) Payload:
a)
Payload on interrogator with 1 optical channel:
4 bytes CH0/s0 + 4 bytes CH0/s1 + (…)
b) Payload on interrogator with 4 optical channels:
4 bytes CH0/s0 + 4 bytes CH0/s1 + (…) + CH3/s0 + CH3/s1 + (…)
c) Payload on interrogator with 8 optical channels:
4 bytes CH0/s0 + 4 bytes CH0/s1 + (…) + CH7/s0 + CH7/s1 + (…)
with sensors in reference wavelength ascending order [s0
wvl
< s1
wvl
< (…) ].