Lighthouse Worldwide Solutions ApexR02p, Operator'S Manual

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ApexRp Operators Manual
248083480-1 Rev 3 66
Data Registers
Data is stored in the input registers (30xxx series), which are read-
only. All data items are four bytes long and are stored across two
registers. Byte and word order is big-endian. Thus, data items are
formed by placing the high bytes in front of the low bytes.
Example: <High Bytes><Low bytes> = <4 Byte Data Item>
Not all particle and analog channels are active. Retrieving data from
an inactive channel returns garbage. See the Data Enable Registers
section of this document for details on how to record data from
active channels.
This entire series of registers represents one data record in the
device. The Record Index Register (40025) must be changed to index
other records here.
The first record in the data buffer is located at Index=0. The most
recently saved value is at Index=-1.