YSI IQ S ENSOR N ET Field bus linking - Manual (Page 33)

IQ S ENSOR N ET Field bus linking Encoded data for field bus communication
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Sensor model
Status info
(INT16)
The data for the sensor model and status info is transmitted as INT16,
i.e. consists of 2 bytes. The assignment is carried out in Motorola for-
mat (the higher value byte first).
Measured value status
(Int8)
The data for the measured value status of the main and secondary
measured values are encoded jointly into a single byte. Bits 7-4 encode
the status of the main measured value, bits 3-0 encode the status of the
secondary measured value.
Other data (INT8) All other data always consist of only a single byte (Int8).
Apart from the byte order described in the bit representa-
tion, another order of the bytes is also possible.
Opposite to the order described, the two lower bytes have
been exchanged with the two upper bytes in this order (b4
b3 b2 b1 - b2 b1 b4 b3).
For field bus applications that can independently interpret
floating point numbers (or allow to select a data format for
certain registers), the byte order the data interpretation is
based on should be checked.
Address Bit representation Information
Offset 0h bits 15-8 High byte
Offset 1h bits 7-0 Low byte
MSB LSB