Rainforest Automation EMU-2 Technical Manual
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Contents
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EMU-2™Technical Manual21Prepay SupportA firmware option is available for EMU-2™ to read the Prepayment Cluster (see theSupported Clusters diagram in the “About the EMU-2” section in this manual). If this isenabled in the firmware build, then the Prepayment Information attribute set is read fromthe meter. If the meter provides this information, then a new Prepaid Balance screen isshown between the Current Price screen and the Message screen:If the meter does not support the Prepayment Cluster, the EMU-2™ can still receive thePrepaid Balance information by using specially formatted text messages. This techniqueis called Message Tunneling. A text message can be sent to the Meter Control System,containing the account balance information, as well as a time stamp and correspondingmeter reading, along with the appropriate meter number. The Meter Control Systemcan forward the text message in the usual way to the meter, and the meter will deliverthe text message via ZigBee to the EMU-2™.If Message Tunneling support is enabled in the EMU-2™, then the incoming textmessage is scanned, looking for the following pattern:PREPAID BALANCE= $xxx.xx (mm/dd/yyyy-hh:mm:ss) zzzzzkWhWhere: xxx.xx is the account balance in dollars mm/dd/yyyy-hh:mm:ss is the date and time stamp zzzzz is the last 5 digits of the meter readingThe information in the text message provides the data necessary for the EMU-2™ toprovide the Prepaid Balance screen. The EMU-2™ can even estimate the up-to-datePrepaid Balance$503.48CustomerDatabaseAMINetworkMeterControlSystemMeter #Text MessageAccount BalanceMeter ReadingSmart MeterTextMessageEMU-2™ |
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