IEC 62056 21 Meter Binding

Documentation of the IEC 62056-21 meter binding bundle

Introduction

This binding is used to communicate to metering devices supporting serial communication according mode C master. It can be used to read metering data from slaves such as gas, water, heat, or electricity meters. For further information read Wiki page of IEC_62056-21.

Information receive from the meter device are structured according IEC 62056-6-1:2013, Object identification system (OBIS). For further information read Wiki page of OBIS ("Object Identification System").

For installation of the binding, please see Wiki page Bindings.

IEC 62056 - 21 Meter Binding Configuration

openhab.cfg

The openhab.cfg file (in the folder '${openhab_home}/configurations') contain following config parameters to configure the binding. The configuration allows the definition of multiple meter devices.

#########################  IEC 620562-21 Meter Binding ####################
# the serial port to use for connecting to the metering device e.g. COM1 for Windows and /dev/ttyS0 or
# /dev/ttyUSB0 for Linux
iec6205621meter:<meter-id1>.serialPort=/dev/ttyS0

# Delay of baud rate change in ms. Default is 0. USB to serial converters often require a delay of up to 250ms
# default is 0ms
iec6205621meter:<meter-id1>.baudRateChangeDelay=0

# Enable handling of echos caused by some optical tranceivers
# default is true
iec6205621meter:<meter-id1>.echoHandling=true

# Perform a module status query every x seconds (optional, defaults to 600 (10 minutes)).
iec6205621meter:refresh=60

NOTE: the <meter-id1> will be used in both the binding item configs and the action calls to defined which of your meter devices is connected to the item.

Generic Item Binding Configuration

Item Binding Configuration

In order to bind an item to the data received from the meter device , you need to provide item configuration settings. The easiest way to do so is to add some binding information in your item file (in the folder configurations/items`). The syntax of the binding configuration strings accepted is the following: The syntax of an item configuration is shown in the following line in general:

iec6205621meter="<meter-id>:<OBIS>"

Where meter-id matches one of the ids defined in your openhab.cfg file.

Examples

Below is an example of represent the current energy counter tarif values as numeric items.

/* IEC 62056-21 Meter data */
Number Tarif_Period	"Chart Period"
Number Tarif1 "High price tarif [%d kwh]" (gEnergy) { iec6205621meter="meter1:1.8.1" }
Number Tarif2 "Low price tarif [%d kwh]" (gEnergy) { iec6205621meter="meter1:1.8.2" }

Rules

In order to calculate the daily accumulated energy consumption below item and script will allow you to present a chart in your sitemap. First create the necessary items:

Number Tarif1Today	"Daily Consumption High Price" (gEnergieConsumption)
Number Tarif2Today	"Daily Consumption Low Price" (gEnergieConsumption)

Second add below script to your rules:

rule "Energy chart"
when
    Item Tarif1 changed or
    Item Tarif2 changed
then
var Number tmp
var Number stopTarif1
var Number stopTarif2
var Number startTarif1
var Number startTarif2
	
if (Tarif1.state instanceof DecimalType && Tarif2.state instanceof DecimalType) {	
	stopTarif1  = Tarif1.maximumSince(now.toDateMidnight).state as DecimalType
	stopTarif2  = Tarif2.maximumSince(now.toDateMidnight).state as DecimalType
	
        //Today
	        startTarif1 = Tarif1.minimumSince(now.toDateMidnight).state as DecimalType
	        startTarif2 = Tarif2.minimumSince(now.toDateMidnight).state as DecimalType
	        
	        tmp = stopTarif1 - startTarif1
	        postUpdate(Tarif1Today, tmp)
	
	        tmp = stopTarif2 - startTarif2
	        postUpdate(Tarif2Today, tmp)
}
end

Third add below Frame to your sitemap:

Frame label="Energie" {
	Text item=Tarif1 {
		Frame {
			Text item=Tarif1 
			Text item=Tarif2
			Chart item=gEnergieVerbrauch period=D refresh=600	
			Chart item=gEnergieVerbrauch period=W refresh=3600 	
		}
	}	
}

Tested Hardware

The binding has been successfully tested with below hardware configuration:

• Landis & Gyr meter ZMD120AR connected via IR-Reader from open hardware project in volkszaehler