MH-RC-MBS-1
User’s Manual r6.
3 EN
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This information is subject to change without notice
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4.
Modbus Interface Specification
4.1
Modbus physical layer
MH-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
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
▪
0: Auto
▪
1: Heat
▪
2: Dry
▪
3: Fan
▪
4: Cool
2
3
R/W
AC unit Fan Speed
1,2
Num. of Fan Speeds
Value
4
(Default)
3
2
1
0
Auto
1
Low
Low
Low
High
2
Mid
Mid
High
-
3
High
High
-
-
4
Powerful
-
-
-
3
4
R/W
▪
1: Position-1
▪
2: Position-2
▪
3: Position-3
▪
4: Position-4
▪
10: Swing
1
Configuration following the Table 4.1 of this document
2
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.
