14
“
MODBUS PARAMETERS
”
Section used to set the identification data for accessing the variable, namely:
-
Register address
: the address of the variable identifiable by the
register mapping provided by the constructor.
-
Register Type
: the type of register: Coil, Input register, Holding
Register.
-
MSW first
: literally "Most Significant Word first", is used for variables
of type Int, Long or Float which may have Big-Endian or Little-Endian
format. The constructor specifies the format used.
-
Little Endian
: for 4-byte variables, represents the Big-Endian or
Little-endian order in each WORD.
N.B. The ModBus device manual should indicate whether or not to select
these latter parameters.
“
VALUE TYPE
”
-
“
Type
”: the data type of the variable. A combo box allows you to easily
select from all supported data types without the possibility of making
mistakes.
-
“
Decimal digit
”: number of decimal
numbers in display and file storage.
-
“
Writable
”: If a variable is writable and you want to be able to change its
value, activate this check-box to enable the write button to appear.
-
“
Multiplication factor
”: the factor by w
hich the raw data will be multiplied
to obtain the correctly engineered variable. Many devices export
information in a non-standard format, for example temperature in tenths
of a degree. To display it in degrees you will need to set this value to 0.1.
-
Offset
: allow a fixed value to be added to the value of the variable being
read.
“
DATA LOG
”
-
“
Enable log
”:
this check-box enables writing to files or not.
N.B.
It absolutely
MUST
be selected in order to store files on the SD
card.
-
Enabled only on timeslot:
if selected, it allows you to define the time
interval within which data is stored. This is used to limit the sending
of unnecessary data. E.g. from 8:00 a.m. to 8:00 p.m.
-
“
Periodic log time
”: variable sampling time, defines every time the
ModBus network master (EasyNET) reads the variable from the Slave
and saves it on file if the log option is enabled.
-
Log on event:
EasyNET makes it possible to store a piece of data on
the occurrence of a certain event which can be:
