Sea-Bird Scientific SBE 25plus, User Manual

Page: 28 / 66

b63–b32 cccccccc conductivity, Hz IEEE 754 format floating point, 32 bit
b95–b64 00pppppp pressure raw ADC counts*
b127–b96 00pppppp pressure
temperature raw ADC counts*
b143–b128 vvvv voltage input 0 V
0
= (code ÷ 2
16
) × 5.000
b159–b144 vvvv voltage input 1 V
1
= (code ÷ 2
16
) × 5.000
b175–b160 vvvv voltage input 2 V
2
= (code ÷ 2
16
) × 5.000
b191–b176 vvvv voltage input 3 V
3
= (code ÷ 2
16
) × 5.000
b207–b192 vvvv voltage input 4 V
4
= (code ÷ 2
16
) × 5.000
b223–b208 vvvv voltage input 5 V
5
= (code ÷ 2
16
) × 5.000
b239–b224 vvvv voltage input 6 V
6
= (code ÷ 2
16
) × 5.000
b255–b240 vvvv voltage input 7 V
7
= (code ÷ 2
16
) × 5.000
b287–b256 iiiiiiii diagnostic
* Pressure and pressure temperature output does not have zero padding (pppppp, not
00pppppp).
The IEEE floating point numbers are decoded below:
31 30 23 22 0
S Exponent (E) Mantissa
Num = (-1)
S
× 2
(E-127)
× 1. M
Diagnostic and status information is not included in real-time data. It is stored in memory
and transmitted from there. The information below is saved with each scan:
Location Hex Variable Encoding
b3–b0 000b Vout fault 0=no fault, 1=fault
Bit position corresponds to channel
b7–b4 000b Vout enable 0=no fault, 1=fault
Bit position corresponds to channel
b15–b8 0xii auxiliary current Raw ADC counts*
b23–b16 0xii system current Raw ADC counts*
b24 0b memory full File system always keeps a few 10s of kb at the end. This bit is
sent and the measurement is stopped.
b25 0b battery low Voltage input too low during deployment. This bit is sent and the
measurement is stopped.
b26 0b serial overflow 1 Serial overflow occurred on this measurement on channel 1.
b27 0b serial overflow 2 Serial overflow occurred on this measurement on channel 1.
b28 0b pump enable Pump is turned on.
b29 0b generic error #1 Miscellaneous error
b30 0b generic error #1 Miscellaneous error
b31 0b generic error #1 Miscellaneous error
* To convert raw ADC counts to current (auxiliary or system, in mA) = 2.5 × raw ADC
counts ÷ 1024.
Deployment and recovery
26