DK-RC-MBS-1
User’s Manual r3.3
EN
© Intesis Software S.L.U. - All rights reserved
This information is subject to change without notice
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4.
Modbus Interface Specification
4.1
Modbus physical layer
DK-RC-MBS-1 implements a Modbus RTU (Slave) interface, to be connected to an EIA-485 line.
It performs 8N2 communication (8 data bits, no parity and 2 stop bit) with several available
baud rates (2400 bps, 4800 bps, 9600 bps -default-, 19200 bps, 38400 bps, 57600 bps, 76800
bps and 115200 bps). It also supports 8N1 communication (8 data bits, no parity and 1 stop
bit).
4.2
Modbus Registers
All registers are type “16
-
bit unsigned Holding Register”
and they use the standard
Modbus big
endian
notation.
4.2.1
Control and status registers
Register Address
(protocol address)
Register Address
(PLC address)
R/W Description
0
1
R/W
AC unit On/Off
▪
0: Off
▪
1: On
1
2
R/W
AC unit Mode
1
▪
0: Auto
▪
1: Heat
▪
2: Dry
▪
3: Fan
▪
4: Cool
2
3
R/W
AC unit Fan Speed
1
▪
1: Low
▪
2: Mid
▪
3: High
3
4
R/W
AC unit Vane Position
1
▪
1: Position-1 (Horizontal)
▪
2: Position-2 (Horizontal)
▪
3: Position-3 (Medium)
▪
4: Position-4 (Vertical)
▪
5: Position-5 (Vertical)
▪
10: Swing
4
5
R/W
AC unit Temperature Setpoint
1,2,3
▪
-32768 (Initialization value)
▪
16..31ºC (ºC/x10ºC)
▪
61..92ºF
5
6
R
AC unit Temperature reference
1,2,3
▪
-32768 (Initialization value)
▪
10..38ºC (ºC/x10ºC)
▪
50..100ºF
1
Available values will depend on the AC unit mode. Check the AC unit model functions in its user manual to know the possible values for
this register.
2
Magnitude for this register can be adjusted to Celsius x 1ºC, Celsius x 10ºC (default) or Fahrenheit. See section 4.2.3 for more
information.
3
It is not possible turn to x10 the value shown in Fahrenheit.
