ONICON D-100 BACnet - Manual (Page 8)

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D-100 Display Module BACnet Installation and Operation Guide 05/14 - 0635-6 / 18341
Page 8
1.4.3 Optional Network Interface With Isolated Digital Pulse Input (Di3)
The D-100-BACnet Display can be provided with an digital input pulse for totalizing pulse
outputs from external devices such as water or gas meters. Pulses are accumulated in an
internal register, and the totalized value is available on the network. This register can be
zeroed via the network. The maximum register is 9,999,999. The register will rollover to
zero when this value is exceeded.
If the digital pulse input option was ordered at the same time the display was ordered,
it will arrive fully configured and ready to use. If it was ordered after the display was
delivered and is being installed as a field upgrade, it may be necessary to configure the
pulse input. The information required to configure the input is provided below and on the
following pages:
The input pulse must meet the following criteria:
1.
Frequency input range, 50 Hz maximum
2. 10 millisecond minimum pulse duration
Input Pulse Definition:
In order to configure the communications card for an digital input pulse, you must
first determine which type of pulse your meter produces. The allowable types of input
pulses are described on the following pages. Based on the type of pulse, set the selector
switch (S1) on the communications circuit board (Fig. 1) to the correct setting.
Fig. 1
120 ohm Jumper Selectable
Termination Resistor
Pulse Type Selector Switch (S1)
Input Impedance Jumper (J1)
Digital Pulse Input (Di3) Connector
RS485 Connector (T1)
NOTE: BACnet MS/TP shown above. See appendix A-4 for BACnet/IP auxiliary input board.