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Debounce Filter:
In order to mitigate the adverse effects of contact bounce, user-adjustable de-bounce logic has
been implemented within the EtherMeter firmware.
The user may adjust the DBn parameter to increase or decrease the pulse sensitivity. DBn refers
to the minimum required pulse width and the minimum required time between pulses (in
milliseconds).
For example, if DBn is set to 60, then all pulses of duration less than 60 milliseconds will be
ignored. DBn can be set to any value between 8 and 500 milliseconds.
Batching Operations:
• CNT1 can be reset to ZERO by writing a ‘1’ to Modbus Coil 9,
or by writing a ‘1’ to Allen Bradley-compatible register B10:0/8.
• CNT2 can be reset to ZERO by writing a ‘1’ to Modbus Coil 10,
or by writing a ‘1’ to Allen Bradley-compatible register B10:0/9.
Pulse Meter Notes:
• Active Voltage and Current Pulses are not supported.
• Each of the EtherMeter’s pulse-input channels contain an integral +5 VDC power supply
and a 10K Ohm pull-up resistor. Therefore, an external voltage source and pull-up
resistor circuit is not required.
• The EtherMeter sources a maximum 0.5 milliamp through the contact circuit.
• Totalization and Flow-Rate Calculations (UNITn, TBn, ROLLn, FCALCn, SAMPn, TOn
parameters) are handled identically for pulse-type meters as for encoder-type meters.
• Factor-of-10 scaling (EXPn parameter) is handled identically for pulse-type meters and
encoder-type meters.
• The pulse count(s) are stored to nonvolatile EEPROM every 8 minutes. Therefore, if the
power to the unit is cycled, then the loss of up to 8 minutes of pulses is possible. To
reduce the likelihood of lost pulses due to power outages, a battery backup power supply
is recommended.
• When the user toggles DIP SWITCH 1 (SETUP/RUN Mode), then the current pulse
count(s) are immediately stored to EEPROM.
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