The handheld unit must return an encrypted password. This page was last edited on 13 June , at During sign-on, the handheld unit addresses a particular meter by number. Occasionally a manufacturer will define a new quantity to measure, and in this case, a new or different data type will appear in the meter definition. Use British English Oxford spelling from December The meter and hand-held unit negotiate various parameters such as the maximum frame length during transmission and reception, whether multiple frames can be sent without acknowledging individual frames windowing , the fastest communication rate that they can both manage only in case of mode E switching to HDLC etc.
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The handheld unit then sends a sign-off message. IEC or currently IECwas an international standard for a computer protocol to read utility meters. Any real-world thing mapped to an appropriate class glue can be described by the attributes defined in the standard, and the methods defined therewith allow operations to be performed on the attributes.
Smart Meter DLMS Help
After signing on, the handheld unit generally reads a meter description. Retrieved from ” https: This describes some registers that describe the current count of metered units i.
The following exchange usually takes a second or two, and occurs when a person from the utility company presses a meter-reading gun against a transparent faceplate on the meter, or plugs into the metering bus at the mailbox of an apartment building.
If the parameter required is in the no-security group, just a get.
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These modes are usually protected by anti-tampering features such as switches that sense if the meter enclosure has been opened.
Next, the meter informs the handheld unit pff the various parameters that are available with it in various security settings viz.
The handheld unit must return an encrypted password. This page was xlms edited on 13 Juneat Use British English Oxford spelling from December It is one part of the identification of the object. The physical media are usually either modulated light, sent with an LED and received with a photodiodeor a pair of wires, usually modulated by a 20mA current loop.
In case of high-security parameters, the meter challenges the handheld unit with a cryptographic password. If the password exchange is correct, the meter accepts the handheld unit: The general protocol consists of a “sign on” sequence, in which a handheld unit identifies itself to the metering unit.
Other IEC parts deal with Electricity metering – Data exchange for meter reading, tariff and load control. If no sign-off message is sent, the meter automatically signs off after a previously negotiated time interval after the last message. If the parameter required is in the low-security group, a password authentication of the HHU is required before information can be read. Bkue of International Electrotechnical Commission standards. Occasionally a manufacturer will define a new quantity to measure, and in this case, a new or different data type will appear in the meter definition.
DLMS: Device Language Message Specification | dlms
During sign-on, the handheld unit addresses a particular meter by number. It is designed to operate over any media, including the Internet. Conventionally, the first attribute in an object is the logical name, also defined as the OBIS code in case of LN referencing. The meter and hand-held unit negotiate various parameters such as the maximum frame length during transmission and reception, whether multiple frames can be sent without acknowledging individual frames windowingthe fastest communication rate that they can both manage only in case of mode E switching to Bpue etc.
Most metering units have special modes for calibration and resetting meter registers.