TECHNICAL MANUAL
LARGE DISPLAYS DN109/NB - DN119/NB - DN189/NB - DN129/NB
CHAPTER 23
WORK OPERATION
23-1
23
WORK OPERATION
The notation for numerical values used in this manual is as follows:
•
Hexadecimal
numbers: Number followed by
“h”.
•
Decimal
numbers: Number followed by
“d”.
•
Binary
number: Number followed by “b”.
•
ASCII
number: As is.
Example: ASCII X character, is 58h, 88d or 1011000b.
ASCII 15 number is 31h 35h, 49d 53d o 110001d 110101d.
XXX
or
xxx
: Sequences of 'X' are used to indicate characters that can be variables, such
as versions or dates.
Work Operation and accepted data types
As mentioned above, this viewer can work with numeric and text (ASCII) data types. If
you work in ASCII, there are specific control commands available that allow you to make a data
flash and change the color of the digit in displays with color option.
In any communication (EXCEPT MODBUS), the information is sent as an ASCII string.
The display is in charge of converting the aforesaid string to a numerical value in case it consists
exclusively of numerical information. Later it will also carry out the necessary actions such as
rounding, showing only the defined decimals, indicating if the value is out of range, etc.
If the ASCII string sent contains alphanumeric characters, the display will go internally to
text mode. This implies that it does not treat decimals or signal values out of range. The text mode
allows to represent non-numeric messages that can be displayed in 7-
segments such as “E 345”,
“P-45” or “HELLO”.
In MODBUS communication, the type of data to be sent depends on the register that is
to be accessed. It will be an ASCII string if register 0 is used, but for the rest the frame must be
formed according to the required numerical format (SWORD, UWORD, SDWORD OR
UDWORD*). All the information regarding the formation of MODBUS frames can be found in
*
SWORD signed word (2 bytes with sign)
UWORD unsigned word (2 bytes without sign)
SDWORD signed double word (4 bytes with sign)
UDWORD unsigned double word (4 bytes without sign)
