Specifications

4-10 OPERATION CHAPTER 4
DT-203X, DT-105X and DT-110X display series
Example.
DISPLAY Num. = ALL displays
Transmission block:
00h 02h 00h 08h 00h 1Dh 00h 0Dh 00h 18h 00h 03h
00h 02h Header.
00h Display numumber 0. All displays
08h Number of bytes in hexadecimal. (16 decimal)
00h 1Dh Reset presentation mode.
00h 0Dh End of data.
00h 18h CRC
00h 03h End of block
4.4.1.9. Display response.
After receiving a transmission block , the display returns a response block of conformity
or error. The response block is:
Start block
Addess
Byte number
Data
End of data
CRC
End of block
00h 02h
Address
08h
05h xxh
00h 0Dh
CRC
00h 03h
Response codes:
“05h 00h” No error.
“05h 01h” Communication error.
“05h 02h” CRC error.
“05h 03h” Data block error.
“05h 04h” Error. It does not find data end.
“05h 05h” Error. The number of bytes is incorrect.
4.4.2. ModBus protocol.
This protocol follows the specification of Modbus Protocol RTU mode. This industrial
protocol is widely used and easy to adapt to a lot of equipment.
The transmission line may be RS-232 or RS-485/RS-422. Using RS-232 the màximum
length is 5m.The transmission line is selected by modifying the parameters. See 4.3.1 “Modify
parameters”.
Modbus protocol uses blanks to control the start and end of block. A blank is the time
necessary to transmit 3 characters. Each Baud Rate has a blank time. At the end of block, no
equipment may transmit until blank time is elapsed.
While ModBus protocol is selected the display works a slave. After each correct block
received the displays sends a response block.