ONICON System-10 User Manual

Johnson Controls

®

Metasys

Johnson Controls Metasys® N2 Network Interface Installation Guide

N2

System-10 BTU Meter

11451 Belcher Road South, Largo, FL 33773 • USA • Tel [phone] • Fax [phone]

0655-5 / 18322

www.onicon.com • [e-mail]

05-14

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System-10-N2 BTU Meter Installation and Operation Guide 05/14 - 0655-5 / 18322 Page 2

TABLE OF CONTENTS

1.0 INTRODUCTION ..................................................................................................5

1.1 PURPOSE OF THIS GUIDE .......................................................................5

1.2 TYPICAL SYSTEM-10 NETWORK INTERFACE MODULE .....................5

1.3 SPECIFICATIONS ......................................................................................5

1.4 NETWORK SIGNAL CONNECTIONS .......................................................6

1.4.1 RS485 ...............................................................................................6

1.4.2 Optional Network Interface with

Isolated Digital Pulse Input (Di3) ................................................... 7

1.5 RS485 BIASING AND TERMINATION ...................................................10

1.6 NETWORK ADDRESSING .......................................................................10

1.6.1 Changing the Device Address .......................................................10

2.0 POINT FILE (.ddl) ...............................................................................................12

2.1 .ddl OR POINT INFORMATION .............................................................12

2.1.1 Single Mode Point Information .................................................... 12

2.1.2 Dual or Bi-Directional Mode Point Information ..........................13

2.1.3 Supplementary Tables ..................................................................14

2.1.4 Sample .ddl Files ..........................................................................17

3.0 NETWORK TROUBLESHOOTING TIPS ...........................................................19

3.1 TROUBLESHOOTING .............................................................................19

APPENDIX

A-1 SYSTEM-10 BTU METER COMPUTER BOARD

A-2 SYSTEM-10 BTU METER N2 BOARD

A-3 SYSTEM-10 BTU METER N2 BOARD with Optional Digital Input Pulse (Di3)

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SECTION 1: INTRODUCTION

1.1 PURPOSE OF THIS GUIDE

The purpose of this guide is to provide installation and commissioning procedures and basic
installation and operating instructions for the ONICON System-10-N2 serial interface.

1.2 TYPICAL SYSTEM-10 NETWORK INTERFACE MODULE

ONICON’s System-10 is a true heat (Btu) computer which accepts data from several sensors,
performs a series of computations with that data, and displays and/or transmits the results as an
indication of the amount of heat (Btu’s) being transferred per unit time or as a totalized amount.
It can also be provided with an optional Metasys
building control network.

BTU X 10,000

SCROLL RESET PROGRAM

SYSTEM-10

BTU METER

®

N2 serial interface to communicate data to the

ONICON insertion
flow meter
(purchased separately)

24 VAC Input
Metasys® N2 Communications

to Johnson Controls System

Supply Temp

Sensor

Supply

Return Temp

Sensor

Return

1.3 SPECIFICATIONS

®

METASYS

N2 NETWORK INTERFACE

N2 RS485
Transceiver: 2-wire, half-duplex
Device address range: 1 – 255 (Default: 017)
Baud rate: 9600
Termination: none
Biasing: none

Heat Exchanger

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1.4 NETWORK SIGNAL CONNECTIONS

!

!

1.4.1 RS485
N2 RS485, 2-wire (half-duplex) serial output connections are connected to
terminal as shown. Do not exceed 4.4 in-lb (0.5 Nm) of torque when tightening.

CAUTION

Only qualied service personnel should make connections between the System-10-N2 BTU Meter
and the user’s external equipment. ONICON assumes no responsibility for damage caused to the
external equipment as a result of an improper installation.

N2 (-)

N2 (+)

CAUTION

Incoming and outgoing RS485 cable shield wires should be connected together, but must not be
connected to the System-10.

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1.4.2 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

AUX. PULSE INPUT (Di3)

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Powered Pulse:

This type of output refers to a pulse which has an associated voltage with it (see Fig. 2).
Set the selector switch, S1 to Pwrd Pulse. The allowable voltage range is 5-24 VDC. The
input impedance is set at the factory to be 11 KOHM via the impedance selector jumper
(J1, see Fig. 1). A lower impedance, 3 KOHM can be selected if required by the instrument
providing the pulse output. Consult the instrument manufacturer or ONICON if you are
uncertain as to the proper jumper selection.

Fig. 2

ONICON BTU Meter

Di3 In (+)

Di3 In (-)

Open Collector (Sourcing):

This type of output refers to an open Collector Switch congured for a sourcing function
(see Fig. 3). Set the selector switch, S1 to SRC. The switch must be rated for at least 20mA
at 20VDC.

Fig. 3

ONICON BTU Meter

Di3 In (+)

Di3 In (-)

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