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D-100 Display Module BACnet Installation and Operation Guide 04/12 - 0635-2 Page 8
1.4.3 Optional Network Interface With Isolated Auxiliary Pulse Input
The D-100-BACnet Display can be provided with an auxiliary 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 auxiliary pulse input option was ordered at the same time the display was ordered,
it will arrive fully congured and ready to use. If it was ordered after the display was
delivered and is being installed as a eld upgrade, it may be necessary to congure the
pulse input. The information required to congure 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 Denition:
In order to congure the communications card for an auxiliary input pulse, you must
rst 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)
Aux Pulse Input Connector (T2)
RS485 Connector (T1)
NOTE: BACnet MS/TP shown above. See appendix A-4 for BACnet/IP auxiliary output board.
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