1660K023G
Page 24 of 30
Communication with commands through RS-485
The displays can obtain the displayed parameters through commands, as well as force the display time
through RS-485 commands. In this case, the display must be configured for not to sync another way or the
sync will rewrite the programmed time. The frames are sent in ASCII (character) format. The end of block is
the one defined by user in parameter 9.3
The following frames can be sent
Command
Code
Display
address
Data
End of block
Display time request
P H
Display temperature request
P T
Display humidity request
P U
Display CO
2
concentration request
P C
Time programming
F H
Display time request
Frame
This frame only includes the code. This does not send any data.
Code
Address
End of block
ACII
P H
H L
Hexa
50h 48h
Example: Request time from the display in address 03.
Code
Address
End of block
ACII
P H
03
Hexa
50h 48h
30h 33h
Response frame
Code
Address
Data
End of block
Code
Address
Day Month Year
Space
Hour
Minute
Second
End of block
ASCII
R H
H L
DD
MM
AA
HH
MM
SS
Hexa
52h 48h
20h
Example: Response from the frame sent in the example before. Time is 13:16:00 16/05/2013
Code
Address
Data
End of block
Code
Address
Day
Month
Year
Space
Hour
Minute
Second
End of block
ASCII
R H
03
16
05
13
13
16
00
Hexa
52h 48h
30h 33h
31h 36h
30h 35h
31h 33h
20h
31h 33h
31h 36h
30h 30h
