Onicon System-10 MODBUS Bedienungsanleitung PDF herunterladen (Seite 8)

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System-10-MOD Network Interface Installation Guide 05/14 - 0653-10 / 18321 Page 8

1.4.3 Optional Network Interface With Isolated Digital Pulse Input (Di3)

The System-10 BTU Meter can be provided with an auxiliary pulse input 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 total 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 BTU Meter was

ordered, it will arrive fully congured and ready to use. If it was ordered after the BTU

Meter was delivered and is being installed as a eld upgrade, it may be necessary to

congure the pulse input. The information required to congure 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 Denition:

In order to congure the communications card auxiliary pulse input, 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 (Di3) Connector (T2)

RS485 Connector (T1)

NOTE: MODBUS RS485 shown above. See appendix A-4 for MODBUS TCP/IP auxiliary input board.

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Onicon System-10 MODBUS Bedienungsanleitung Seite 8