Modbus Interface Specification; Modbus Physical Layer; Modbus Registers; Control And Status Registers - IntesisBox MH-RC-MBS-1 User Manual

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)
0
1
2
3
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.
© Intesis Software S.L.U. - All rights reserved
This information is subject to change without notice
®
IntesisBox is a registered trademark of Intesis Software SLU
MH-RC-MBS-1
Register Address
(PLC address)
1
2
3
4
R/W Description
AC unit On/Off
R/W
0: Off
▪
1: On
▪
AC unit Mode
0: Auto
▪
1: Heat
▪
R/W
2: Dry
▪
3: Fan
▪
4: Cool
▪
AC unit Fan Speed
Value 4
(Default)
0
R/W
1 Low
2 Mid
3 High
4 Powerful
AC unit Vane Position
1: Position-1
▪
2: Position-2
▪
R/W
3: Position-3
▪
4: Position-4
▪
10: Swing
▪
URL
Email
Phone
User's Manual r6.3 EN
1,2
Num. of Fan Speeds
3 2 1
Auto
Low Low High
Mid High -
High - -
- - -
2
http://www.intesisbox.com
info@intesisbox.com
+34 938047134
7/23