Frico FCR230 User Manual

FCR230 Modbus-BACnet

Modbus signal types 2

Modbus signals 4

Coil status register 5

Input register 6

Holding register 7

BACnet signal types 12

BACnet signals 13

Modbus signal types

EXOL types EXOL signal types:

R = Floating point number (Real) (-3.3E38 - 3.3E38)

I = Whole number (Integer) (-32768 - 32767)

X = Index (0 - 255)

L = Logic (Logic) (0/1)

Modbus types Modbus signal types (types listed below):

1 = Coil Status Register (Modbus function = 1, 5 and 15)

2 = Discrete Input (Modbus function = 2)

3 = Coil Status Register (Modbus function = 3, 6 and 16)

4 = Input Register (Modbus function = 4)

Supports the following Modbus functions:

1 = Read Coils

2 = Read Discrete Input

3 = Read Holding Register

4 = Read Input Register

5 = Write Single Coil

6 = Write Single Register

15 = Write Multiple Coils

16 = Write Multiple Registers

Scaling factor Modbus All floating point numbers have a scaling factor of 10. Integers, Index and Logic signals always

have a scaling factor of 1.

EXOline/Modbus The RCF controller will automatically switch between EXOline and Modbus, depending on

what type of communication is used. This switch-over will take place without any errors in communication resulting. The exception is when communicating via Modbus with a configuration of 8 bits, no parity and 1 stop bit, in which case the switch must be made manually.

Wiring, Modbus A Modbus type protocol consists of multiple layers (OSI model). The bottom layer is always

the physical layer, the number of connection wires and signal levels. The next layer describes the communication digits (number of bits, stop bits, parity bits etc). After these come the layers describing Modbus-specific functions (number of digits per message, the meaning of different messages, etc). For Modbus, the bottom layer can be either RS485, RS422 or RS232.

RS485 and RS422 RS485 and RS422 constitute the purely electrical part of the protocol, ie. the physical layer.

RS485 has two connections, A and B. Often, there is also a Protective earth (N on EXO controllers). RS485 units are connected A  A and B  B. It may prove necessary to shift A and B in order to make Modbus work properly. RS485 is a so called half duplex communication: The communication can only go in one direction, eg. the main unit will initially send a request, and thereafter listen to the reply. A and B are used both for sending and receiving.

RS422 is a full duplex communication, meaning that 4 connecting wires are required; 2 for sending (Tx+ and Tx-) and 2 for receiving (Rx+ and Rx-). Tx is used for sending and Rx for receiving, meaning the Tx in a unit must be connected to the Rx in another and vice versa. Pertaining to signal levels, etc., RS422 and RS485 are identical.

In order to connect RS485 and RS422: Connect Tx+ to Rx+ and Tx- to Rx- on the RS422 unit. We have now changed a 4-wire system to a 2-wire system and can connect them to A and B on the RS485 unit. It is usually easiest to find out what fits where simply by experimenting. Wrong polarity makes the system not function but is incapable of harming any unit.

Tx+ -----|---------------------------------------- A (or B) | Rx+ -----|

Tx- -----|---------------------------------------- B (or A) | Rx- -----|

Bit rate, two stop bits, parity is next layer.

These settings must correspond to the settings in the main unit. Find out what the settings for the main unit are, and then enter the same settings into the controller.

Parity can be set to odd, even (FS) or none. If no parity is set, two stop bits will automatically be used. If odd or even parity is set only one stop bit will be used, or the total amount of bits will be too great. 1 start bit, 8 data bits, 1 parity bit and 1 stop bit gives a total of 11 bits, which is the maximum.

Modbus signals

RC_Actual_L.RegioDigOut(0)

L,2 5 Not used

RC_Actual_L.RegioUDigOut1

L,2

Heating (Value on digital output 4)

RC_Actual_L.RegioDIChangeOver

L,2

Indicates change-over from digital input

RC_Actual_L.RegioCVHeatPulsProp

L,2

Indicates pulse prop. heating

Discrete inputs

Name of signal Type

RC_Actual_L.RegioDigIn(0) L,2 1 Not used

RC_Actual_L.RegioDigIn1 L,2 2 Value on digital input 1

Not used in this model L,2 3

RC_Actual_L.RegioUDigIn1 L,2 4 Value on universal digital input 1

RC_Actual_L.RegioDigOut1 L,2 6 Value on digital output 1

RC_Actual_L.RegioDigOut2 L,2 7 Value on digital output 2

RC_Actual_L.RegioDigOut3 L,2 8 Value on digital output 3

Not used in this model L,2 9-10

RC_Actual_L.RegioUDigOut2 L,2 12 Cooling (Value on digital output 5)

RC_Actual_L.RegioDIOpenWindow L,2 13 Indicates open window

Not used in this model L,2 14

RC_Actual_L.RegioDIPresences L,2 15 Indicates presence from digital input

RC_Actual_L.RegioFanSpeed1 L,2 17 Indicates fan speed 1

RC_Actual_L.RegioFanSpeed2 L,2 18 Indicates fan speed 2

RC_Actual_L.RegioFanSpeed3 L,2 19 Indicates fan speed 3

Not used in this model L,2 20

Modbus address

Description

RC_Actual_L.RegioCVCoolPulsProp L,2 22 Indicates pulse prop. cooling

RC_Actual_L.RegioCVHeatInc L,2 23 Indicates increase heating/cooling DO4

RC_Actual_L.RegioCVHeatDec L,2 24 Indicates decrease heating/cooling DO5

Not used in this model L,2 25-26

RC_Actual_L.RegioAIChangeOverState L,2 27 Indicates change-over status from

analogue input

RC_Actual_L.RegioChangeOverState L,2 28 Indicates change-over status from both

digital and analogue input

Not used in this model L,2 29-30

RC_Actual_L. RegioPresence L,2 31 Occupancy indication (with on- and

switch-off delay)

Not used in this model L,2 32-33

Coil status register

unless this value is first set to “0”.

the fan can be switched off.

Name of signal Type

Not used in this model L,1 1 0

RC_Setp_L.RegioShutDown L,1 2 0 Puts the unit in Shutdown mode.

RC_Setp_L.RegioFireAlarmStop L,1 3 0 Places the unit in Shutdown mode and

RC_Setp_L.RegioDiNC(0) L,1 4 0 Not used

RC_Setp_L.RegioDi1NC L,1 5 0 Normally open (NO) or normally closed

Not used in this model L,1 6 .

RC_Setp_L.RegioUDi1NC L,1 7 0

Not used in this model L,1 8 -

RC_Setp_L. RegioDO4NC L,1 9 1 DO4 NO/NC

RC_Setp_L.RegioDO5NC L,1 10 1 DO5 NO/NC

RC_Setp_L.RegioDilAct L,1 11 0 DI1-activation (presence/window) 

RC_Setp_L.RegioMPAct L,1 12 0 Activation of Mould protection.

RC_Setp_L.RegioTermoModel L,1 13 0 EEPROM storage of Thermo model

RC_Setp_L.RegioMinFanSpeed L,1 14 1 The fan is run at its minimum speed setting

Modbus address

Default value

Description

prevents it from being activated again,

(NC) on digital input. 0=NO, 1=NC.

Normally open (NO) or normally closed (NC) on universal digital input. 0=NO, 1=NC.

Economy/Off

variable (3-point actuator)

if the automatic fan control calculates that

Not used in this model

RC_Setp_L.RegioComFactoryDefaults

RC_Setp_L.RegioBlockConfig

RC_Setp_L.RegioPreventManualFanSp eed

- 15

L,1 16 0

L,1 21 0 Blocks the option to enter the parameter

L,1 22 0 Prevents the fan speed from being changed

Set communication parameters to factory settings (does not apply to addresses):

1 = Factory settings (resets to 0)

list using the buttons on RCF.

manually if the fan is not set to auto (parameter 25).

Input register

RC_Actual_X.RegioVerMinor

X,4 3 Minor version

2 = Cooling

RC_Actual_R.RegioRoomTempInt

R,4

Room temperature from internal sensor

RC_Actual_R.RegioUAnaOut2

R,4

Value on universal analogue output 2

RC_Actual_R.RegioCoolOutput

R,4

Cooling output signal (0…100 %)

RC_Actual_R.RegioSupplyAirPIDout

R, 4

Supply air controller output

Name of signal Type

RC_Actual_X.RegioSoftware X,4 1 Type of Regio software:

RC_Actual_X.RegioVerMajor X,4 2 Major version

RC_Actual_X.RegioVerBranch X,4 4 Branch version

RC_Actual_X.RegioRevision X,4 5 Revision

Not used in this model X,4 6

RC_Actual_X.RegioUnitState X,4 7 Current running mode:

RC_Actual_X.RegioControllerState X,4 8 Current control:

RC_Actual_X.RegioFanSpeed X,4 9 Current fan speed:

Not used in this model X,4 10

RC_Actual_R.RegioRoomTemp R,4 11 Room temperature

RC_Actual_R.RegioRoomTempExt R,4 12 Room temperature from external sensor

Modbus address

Description

0 = RCP 1 = RC

0 = Off 1 = Economy/Standby 2 = Not used 3 = Not used 4 = Comfort

0 = Off 1 = Heating

0 = Off 1 = Fan speed 1 active 2 = Fan speed 2 active 3 = Fan speed 3 active

RC_Actual_R.RegioAIChangeOver R,4 14 Change-over temperature

RC_Actual_R.RegioAnaIn1 R,4 15 Value on analogue input 1

RC_Actual_R.RegioUAnaIn1 R,4 16 Value on universal analogue input 1

RC_Actual_R.RegioUAnaOut1 R,4 17 Value on universal analogue output 1

Not used in this model 19

RC_Actual_R.RegioPIDSetP R,4 20 Controller setpoint

RC_Actual_R.RegioPIDOutput R,4 21 Controller output signal (0…100 %)

RC_Actual_R.RegioHeatOutput R,4 22 Heating output signal (0…100 %)

RC_Actual_R.RegioAI1Raw R,4 24 Raw value for analogue input 1

RC_Actual_R.RegioUI1Raw R,4 25 Raw value for universal input 1

RC_Actual_R.RoomTemp_NTC2 R,4 26

RC_Actual_R.RegioSupplyAirTemp R, 4 47 Supply air temperature from sensor connected

RC_Actual_R.RegioPID2Setp R, 4 49 Room controller output (scaled) and supply air

Room temperature input value from secondary internal sensor

to AI1

controller setpoint

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Frico FCR230 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Modbus signal types

Modbus signals

Discrete inputs

Coil status register

Input register