Instructions

Intesis
TM
INMBSPAN001I100
User’s Manual r1.2 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
INMBSPAN001I100 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, 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-1
▪ 3: Mid-2
▪ 4: Mid-3
▪ 5: High
3
4
R/W
AC unit Vertical Vane Position
1
▪ 0: Auto
▪ 1: Horizontal
▪ 2: Position-2
▪ 3: Position-3
▪ 4: Position-4
▪ 5: Vertical
▪ 6: Swing
4
5
R/W
AC unit Temperature setpoint
1,2,3
▪ -32768 (Initialization value)
▪ 16..30ºC (ºC/x10ºC)
▪ 61..88ºF
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.