Westaflex WAC Binding

Table of Contents May we introduce... Internet of Things Feature Dashboard Code Sample

May we introduce...

Tradename	Tags	Keynote	Shortcut
WAC	metal components	Industry4.0	HVAC
	New generation of ERV Energy Recovery Ventilation Systems in multi-zone modular or ceiling installation. It's perfect for the needs of craftsmen.
Quadroflex	metal-to-metal-joint	any-shape tube	Fittings
	Westaflex products are used in a variety of applications including automotive production, train technology (ICE ventilation), for the air supply and ventilation of living spaces, exhaust technology and water treatment.
Modbus	Utility, SCADA, Statistics	RS-232, RS-485	DIY
	Modbus is a serial communications protocol for use with its programmable logic controllers (PLCs). Modbus enables communication between many (approximately 240) devices connected to a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems.
Westaflex	aluminium, stainless steel, plastic	since 1933	SME
	Westaflex is a manufacturer of HVAC appliances, commercial equipment, based in Gütersloh, Germany. It was founded as a family business and has always been a privately held, family-owned, family-run company.

Internet of Things

A Modbus command contains the Modbus address of the device it is intended for. Only the intended device will act on the command. All Modbus commands contain checksum information, to ensure a command arrives undamaged. Since Modbus is a master/slave protocol, only Modbus TCP connects over port 502, as the Modbus ASCII protocol defines a message structure that controllers will recognize and use, regardless of the type of networks over which they communicate. Our WAC systems use default modbus data provided by Arduino barebones e.g. a Debian Rasberry server kit all year long. Binding is compatible with latest models since 2013,

which bring lots useful features from the Modbus (Utilities, SCADA, and Statistics like Min/Average/Max). “We believe that the days of monologue on the Internet-of-Things have ultimately given way to dialogue, which, on the other hand, means that we have to react correspondingly.”

Feature Dashboard

Each device intended to communicate using Modbus is given a unique address and the data types are named from its use in driving relays: a single-bit physical output is called a coil. Our various reading, writing and other operations are categorised as follows:

Name	Modbus function	Data address	Values
Heat	01h_Read_Coils	0	1-active, 0-passive
	Plate heat exchanger frost protection function
Fire	01h_Read_Coils	1	1-active, 0-passive
	Fire alarm
Filter	01h_Read_Coils	2	1-active, 0-passive
	Dirty filter alarm
Fan	01h_Read_Coils	3	1-active, 0-passive
	Fans alarm
LowPower	01h_Read_Coils	5	1-active, 0-passive
	Low voltage
Textract	01h_Read_Coils	6	1-active, 0-passive
	Temperature sensor alarm
Texhaust	01h_Read_Coils	7	1-active, 0-passive
	Exhaust air temperature sensor alarm
Timit	01h_Read_Coils	8	1-active, 0-passive
	Supply air temperature sensor alarm
RH	01h_Read_Coils	9	1-active, 0-passive
	DTJ(100) humidity sensor alarm (controller works in determining the moisture content of 70%)
ReturnWater	01h_Read_Coils	10	1-active, 0-passive
	Return water temperature sensor alarm
ToutDoor	01h_Read_Coils	11	1-active, 0-passive
	Outside air temperature sensor alarm (controller continues to work in determing ToutDoor less than zero degree)
MotorActive	01h_Read_Coils	12	1-active, 0-passive
	Fans ON
InDumpper	04h_Read_Input	13	0-90
	Outside air damper actuator
Preheater	01h_Read_Coils	14	1-active, 0-passive
	Preheater indication
Heater	01h_Read_Coils	15	1-active, 0-passive
	Heater indication
Speed	06h_Write_Holding_Register	16	0, 1, 2, 3
	Fans speed setting
TsetPoint	06h_Write_Holding_Register	17	0-30
	Supply air temperature set
RH_value	04h_Read_Input	18	0-99
	DTJ(100) humidity sensor value
Motor1	04h_Read_Input	19	0-3
	Motor 1 fan speed value
Motor2	04h_Read_Input	20	0-3
	Motor 2 fan speed value
Tlimit	04h_Read_Input	21	Hex: E0
	Supply air temperature value
Texhaust	04h_Read_Input	22	Hex: E0
	DTJ(100) temperature sensor value
Textract	04h_Read_Input	23	Hex: E0
	Exhaust air temperature sensor value
ToutDoor	04h_Read_Input	24	Hex: FFEC
	Outside air temperature sensor value
Twater	04h_Read_Input	25	Hex: FFEC
	Return water temperature value

Code Sample

to handle many slaves in RTU mode, non blocking connections and RTS flow control.....

modbus_t *mb;

  uint16_t tab_reg[32];

  mb = modbus_new_tcp("127.0.0.1", 1502);
  modbus_connect(mb);

  /* Read 5 registers from the address 0 */
  modbus_read_registers(mb, 0, 5, tab_reg);

  modbus_close(mb);
  modbus_free(mb);

See Examples of typical WAC Bindings, if you have any suggestions or questions don't hesitate to contact us or use the openHAB google group. The snapshot version of our industry4.0 binding can be downloaded, together with the rest of openhab.