wavin DRT-200, Design Manual

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Design Manual
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8 8.. C Co on nn ne ec ctt tto o B Bu uiilld diin ng g M Ma an na ag ge em me en ntt
S Sy ys stte em m ((B BM MS S))
The WTC-3 can communicate with the most of the BMS
system via the MODBUS-RTU communication protocol. The
BMS system can read and control the major of data inputs
(heating/cooling mode, temperatures and economy mode) of
the WTC-3.
8 8..1 1 C Co om mm mu un niic ca attiio on n
P Ph hiis siic ca all iin ntte errffa ac ce e:: RS-485, half-duplex
L Liin ne e e en nd d c cllo os siin ng g:: ON:switch turn to the
corner
M Ma ax x n nu um mb be err o off c co on nn ne ec ctte ed d W WT TC C:: 64
tty yp pe es s o off w wiirre e:: 2 pcs twisted pair of wire
(example: CAT5 UTP)
P Prro otto oc co oll::
MODBUS-RTU
D Da atta a e ex xc ch ha an ng ge e s sp pe ee ed d rra atte e:: 9600bps
P Pa arriitty y:: N
D Da atta a b biitt:: 8
S Stto op p b biitt:: 1
R Re ep plly y ttiim me e lliim miitt:: TIMEOUT = 500ms
M Ma ax x rre ea ad diin ng g v vo ollu um me e a att o on nc ce e:: max 32 pcs register
or 256 bit
8 8..2 2 M MO OD DB BU US S c co om mm ma an nd ds s
Commands Code (dec) Action
Get Coils 01 to bit read out
Get Bits 02 to bit read out
Get Holding Regs 03 to register read out
Get Input Regs 04 to register read out
Set Bit 05 to bit writing
Write Single Register 06 to register writing
Set N Bits 15 to more bit writing in same time
Set Holding Regs 16 to more register writing in same time
8 8..3 3 R RJ J4 45 5 p pllu ug g w wiirriin ng g
Pin number Function
1 RS485-B
2 RS485-A
3 Free
4 GND (ground)
5 GND (ground)
6-8 Free