Delphin Expert Logger Manual page 194

Expert Logger
These settings are dependent on the
whether the channel is an input or output.
Data type
l
Specifies the data type for interpreting the transmitted payload data. Bit
length, Byte order and Word order are set and adjusted in relation to the
adopted setting. Start position in payload
output are also set according to the data type.
Signed
l
Sets whether the integer data type is to be interpreted as signed or
unsigned. An 8-bit value would then be in the range -128 to 127 (two's com-
plement) or 0 to 255. Floating values are always interpreted as signed. Bit-
values make no distinction between signed and unsigned.
Bit length
l
Sets the bit lengths for integer and floating data types. Byte sequence and
Word sequence are adjusted according to length value. This also applies to
the numeric fields in the Start position in data.
Encoding type
l
Displays the encoding type used for interpreting the transmitted payload
data.
Byte sequence
l
The byte order (byte sequence) is a number, made up of several bytes, that
sets how bytes are ordered for the address. BigEndian, also known as
Motorola format, orders the most significant byte to the lowest address.
LittleEndian, also known as Intel format, orders the least significant byte to
the lowest address. Refer also to http://en.wikipedia.org/wiki/Endianness.
Word order
l
Like the byte order, word order orders word data (1 word = 2 bytes = 16
bits) to addresses. In addition to determining byte order, a different word
ordering may be necessary.
Byte pattern (input channels only)
l
To display the different byte and word order combinations, a hex value (a ran-
dom number in the example) is shown with the resulting byte pattern of a
message.
Scaling
If a Modbus user sends values that require conversion, enable
enter Min / Max values to convert from the Input
Use channel as output
If the
opposite direction: Enter the range from the source data in
the range for the output signal in
Without scaling, the channel's Data type is used When scaling is
enabled, the floating data type is always used for the channel.
This also applies when the channel is used as an output: When scal-
ing is enabled, the channel must have the floating data type, oth-
erwise you have to use the type under Data type.
Delphin Technology AG
Function code
data, Scaling and Use channel as
option is used, scaling takes place in the
Output value
.
194
inputs and also on
Scaling
value
to the Scale value.
Scale
value a nd
Expert Logger
Januar 2018
and
Manual