Specifications

4-4 OPERATION CHAPTER 4
DT-203X, DT-105X and DT-110X display series
4.4. Protocols.
Protocols are the procedures used by displays to communicate with other equipment.
Each protocol has its own specifications explained in detail in the following paragraphs.
Definitions of words used in protocol descriptions:
Message: Alphanumerical text of one or more lines (according to display model). For
each message, a line must be static or dynamic. In static message, line text is equal to or
shorter than the number of characters of on a line. Dynamic messages have more characters
than the line and are showed scrolling from right to left.
Message number: The number that identifies the message. The valid range is 0 to 512.
Variable: A variable is a group of characters the value of which is set in execution time.
At edition time, you must reserve a place for each character variable. A message may display a
maximum of 16 variable characters per line. An 8 line display may display 128 characters.
Inside each line, the 16 variable characters can be grouped as you want. 16 variables of
1 character or 1 variable of 16 characters.
Examples:
[v] = Character variable.
TOTAL= [v][v][v] 1 Variable of 3 characters.
PARTIAL= [v][v][v] TOTAL= [v][v][v][v][v]
2 Variables. 1 of 3 characters and 1 of 5 characters
Interface: Is the hardware link between equipment. There are two interfaces RS-232
and RS-485. Both interfaces support all the protocols.
Displays DT-105/110/203/X have 5 protocols implemented in all models.
1- TDL Protocol. Developed for this display products.
2- Modbus Protocol. Industrial protocol.
3- Omron Protocol. Protocol for Omron products.
4- ASCII Protocol. This protocol uses ASCII characters and is easy to implement.
5- S7-200 Protocol. Protocol for Siemens S7-200 PLC’s.
In this paragraph, the different protocols will be explained, as well as the programmation
of the displays through them. The formats of values of the numbers and characters are written
in this manual are:
 When telling about a hexadecimal number, this will be followed by an “h”.
 When telling about a decimal number, this will be followed by a “d”.
 When telling about a binary number, this will be followed by a “b”.
 When telling about an ASCII character, this will be explained in the context.
As an example, the X ASCII character can be explained as 58h, 88d or 1011000b, as
needed in the moment. Number 15 ASCII can be seen as 31h 35h, 49d 53d or 110001d
110101d.