Units External Connections; Modbus - Swegon CASA R3 Smart Installation, Commissioning And Maintenance Instructions

4. Units external connections

This section contains information to connect ventilation unit to external devices or system. The unit has in build Modbus
RTU interface to complete control. The units operating modes and functions can be controlled with switch inputs (DI)
or with voltage (0...10 V). The unit state can be monitored from relay outputs or voltage output (0...10 V).

4.1 Modbus

Unit has in build Modbus RTU interface (slave) and it's
available in a SEC* or SEM* module. SEC IO-extension
cable Modbus interface is designed for single point
connection. SEM IO-extension module Modbus interface
is designed for easy connection to large network with in
and out connectors for A, B and for two shield or ground
connectors.
Installation
Install Modbus network cabling as described in external
connections diagram.
NOTE! Install bus termination to chains last unit (in SEM
use bus terminated jumper, JP1).
NOTE! Shielded cable must be grounded only from one
point (master). SEM has two internally connected connec-
tors for shield/ground chaining.
Settings
Modbus settings can be changed in Settings/(1234)/
Modbus menu.
Modbus
Address
Baud
Data bits
Stop bits
Parity
Smart Access
If Smart Access is connected to the SEC/SEM module
select Smart Access for correct settings. Normally Smart
Access cable should be connected inside electrical box.
Register access
Modbus registers defined in registers list are direct ac-
cessible without password. All defined registers are PLC
addresses (base 1). Most commonly used registers are
listed below.
Holding control registers
4x5001 Operating mode
4x5018 Emergency stop
4x5101 Temperature setpoint °C
4x5406 Reset all alarms
14 www.swegon.com
1
38 400
8
1
None
0 = Stop
1 = Away
2 = Home
3 = Boost
38 400
4 = Travelling
0 = Disabled
1 = Active
2 = Over
pressurising
38 400
1 = Reset
Input registers
3x6201 Fresh air temperature 0,1 °C
3x6203 Supply air temperature 0,1 °C
3x6204 Extract air temperature 0,1 °C
3x6213 CO2
3x6214 RH
3x6217 VOC
3x6205 Supply fan RPM
3x6206 Extract fan RPM
3x6301 Unit state
3x6302 Operating mode
3x6136 Combined alarm
3x6137 Combined info
Full register list:
www.swegonhomesolutions.com
*) Accessory
R2.060219
PPM
%
PPM eqv.
1/s
1/s
0 = Ext. stop
1 = User stop
2 = Start
3 = Normal
4 = Commissioning
0 = Stop
1 = Away
2 = Home
3 = Boost
4 = Travelling
See full list
See full list
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