Instructions

Intesis
TM
INMBSDAI001R000
User’s Manual r3.8 EN
© HMS Industrial Networks S.L.U. - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
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4. Modbus Interface Specification
4.1 Modbus physical layer
INMBSDAI001R000 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
▪ 0: Auto
▪ 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 0 for more information.
3
It is not possible turn to x10 the value shown in Fahrenheit.