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13.3
Reading Registers
Registers may be read singularly or in blocks. It should be noted that
registers are updated once every second in an atomic operation. In this
way this register set can be considered a single data point. It should be
obvious that reading multiple single registers cannot ensure that the
data returned is from the same data set. If that is not important then
reading single registers is an acceptable approach, however, often it is
important to read several values at the same time since they relate to
the state of the unit at that time. For this reason, it is recommended that
a block of registers be read at the same time. Key values have been
grouped to make this possible. If the local timestamp is important, then
start reading at address 100. If not, start reading at address 104. The
simplest way to do this is to use the READ HOLDING REGISTERS
command (03).
Note that the units of some measurements are normalised integer
numbers and others are IEE754 floating point numbers. For example,
temperature is an integer reported with a precision of 1/100
degree. SNR is also reported this way. Note that the reporting precision
does not reflect the accuracy the measurement. For the accuracy of the
unit's measurement, refer to the manual.
13.4
Writing Updateable Registers
Registers highlighted as RW are updateable. They provide the ability to
update the unit's configuration. Except for the Regime register (register
5, offset 4), all updateable registers can be updated from both the unit
and the Modbus, that is that is the unit's settings may determine the
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