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• volume read from flow transducer
• readings of counters on four additional pulse inputs (as volume or energy in the additional tariff from
1 to 4 in succession) NOTE: the counter value is not transmitted if its input is deactivated
• instantaneous temperatures, flow and power
• error code
• standard and non-standard working time
It is possible to remotely read the data records registered as shown in section 5.3 of this description.
The configuration data reading and saving is only possible with the ElfSerwis software. It is possible to
remotely set the configuration parameters; however, some of them require installing the jumper which
enables the service mode.
The following are the parameters changed with the jumper installed:
• full metrological configuration, selection of flow sensor type and its calibration;
• calibration of the resolver with the temperature sensors as the reference;
• selection of supply/return;
• selection of GJ/kWh/Gcal;
• setting the initial value (resetting) of the heat consumption meter;
• differential temperature insensibility.
The list of parameters which can be set remotely without the jumper:
• setting the initial values (resetting) of all pulse inputs, operating time, error operating time and volu-
me counter;
• pulse constants for all auxiliary inputs;
• configuration of the number of registrations within archives;
• determination of period for registration of cycle 1 and 2 data;
• pulse output configuration;
• parameters of error 2 detection (no flow at high differential temperature);
• setting the unique customer/user number;
• network address and baud rate – requires respective changes in the user PC;
• selection of hours, days of month and months of year for recording.
Note on readout frequency and default transmission settings:
Transmission of data from Elf increases consumption of the battery power. If readout frequency
is higher 15 minutes, the battery life may be shorter. This applies only for the default baud rate
of 2400; if a lower baud rate is selected, the readout frequency is proportionally lower. The CPU
flash memory stores the number of transmissions sent by the heat meter, so it is possible to check
the data readout frequency following replacement of the dead battery. If the defined transmission
number is exceeded in the design operating life of 5 years of the heat meter (which is approx.
880,000 bytes of U ART transmission for M-Bus readouts), the manufacturer shall not be liable for
premature battery discharge and shutdown of the device. The transmission parameter defaults
are: 2400,8,e,1; network number 1; customer number is the serial number.
7.1.1. Interface connection diagram
The following diagrams show the sequence of signals on the screw terminals of the interfaces in all
available heat meter versions. The diagram shows the connection of dry contacts for the pulse inputs.
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