MODBUS Register Map v1.48, Rx104P
248083336-1 Rev 3 A-9
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 for integer data 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>
IEEE floating point has big-endian byte order and little-endian word
order. Thus, analog data items are formed by placing the low bytes in
front of the high bytes.
Example:
<Low Bytes><High Bytes> = <4 Byte Data Item>
Not all particle and analog channels are necessarily 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.
Table A-8 Data Registers
Register Data Type Description
30001 signed integer Timestamp [high] (# of seconds
since midnight, 1/1/1970)
30002 signed integer Timestamp [low]
30003 unsigned integer Sample Time [high] (In seconds)
30004 unsigned integer Sample Time [low]
30005 signed integer Location [high] (Place where data
was recorded)
30006 signed integer Location [low]
30007 unsigned integer Data Status [high]
30008 unsigned integer Data Status [low]
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