Specifications

ManualsBrandsArrow ManualsLawn and GardenVM1012-B

4-20 OPERATION CHAPTER 4

DT-203X, DT-105X and DT-110X display series

4.4.4. ASCII protocol.

The ASCII protocol is an easy protocol to connect between the display an any kind of

equipment with a serial line, like a PC. This protocol also allows displays to be connected in a

network by means of an RS-485 interface.

In this protocol, the display works a slave. It waits to receive a transmission block and if

it is correct, acknowledges the block and displays data.

Transmission block

Start

Address high

Address low

Code

Data

End

ASCII

0 to 9

E D

A......Z

* CR

Hexa

40h

30h to 39h

45h 44h

41h.......5Ah

2Ah 0Dh

Start: 1 Byte. Always 40h

Address: 2 Bytes. Display address. Valid range 0 to 99 in ASCII format. All messages

sent with address 0 are accepted for all displays in the network but none responses.

Code: 2 Bytes. Always ED (45 44 h)

Data: From 1 to 160 Bytes. Message sent to display. The first character is placed

furthest to the left on display.

Special characters:

0Ah = New line. Valid in more than one-line displays.

08h = Start of flashing characters.

09h = End of flashing charcaters.

00h 15h = Display date in format dd/mm/yy.

00h 16h = Display time in format hh:mm.

00h 18h = Display time in format hh:mm:ss

00h 1Ch = Set date and time. Format ddmmyy hhmm.

00h 22h = Brightness adjust. To adjust the display brightness. Valid range

from 1 to 8 in ASCII code.

Example: 00h 22h 38h Adjust to highest brightness.

ONLY WITH HUMIDITY AND TEMPERATURE OPTION

00h 1Eh displaying temperature in Celsius. It needs 6 characters.

00h 1Fh displaying temperature in Farenhait. It needs 6 characters.

00h 21h displaying relative humidity. It needs 2 characters.

End: 2 bytes. Always * CR (2Ah 0Dh).

4.4.4.1. Response block.

The display sends a response block if the address of received block is greater than 0

and equal to the display address.