Contents

1.

INTRODUCTION

 

3.

MEMORY MAP

 

 

 

Definitions

2

 

Primary Data Tables

7

 

Minimum System Requirements

2

 

SYNC Boiler Memory Map

7-8

2.

CONFIGURATION

 

 

Input Registers

8

 

Addressing

3

 

Holding Registers

8

 

Timing Specifications

4

 

Configuration Bits

8

 

Parity

4

4.

WIRING REQUIREMENTS

 

 

 

Data Transmission Mode

4

 

Physical Wiring

9

 

Modbus Board Diagnostics

4

 

Typical Boiler System Wiring

12-13

 

Internal Faults

4

5.

UNIT OPERATION

 

 

 

Modbus Function Set

5

 

Unit Operation with Modbus Communications

14-17

 

Modbus Exception Codes

6

6.

TROUBLESHOOTING

18-19

 

 

 

7.

DIAGRAMS

 

 

 

 

 

 

Ladder Diagram Part 1 & 2

20-21

 

 

 

 

Wiring Diagram

22

 

 

 

Revision Notes

Back Cover

1Introduction

The information contained in this manual provides general guidelines for the implementation of Modbus communication with the Lochinvar SYNC boiler.

All Modbus networks are implemented utilizing a master-slave arrangement where all SYNC boilers are slaves and the master is a building automation system capable of communicating over a RS-485 serial connection.

Definitions

Abbreviation or Acronym

Meaning

 

 

ASCII

American Standard Code for Information Interchange

 

 

BAS

Building Automation System

 

 

Baud (Baud Rate)

Number of data bits transmitted per second (bps)

 

 

EMS

Energy Management System

 

 

FDX

Full-Duplex

 

 

HDX

Half-Duplex

 

 

Hex

Hexadecimal Number (0 - 9, A - F)

 

 

I/O Box

Input/Output (I/O)

 

 

LSB

Least Significant Byte

 

 

Modbus®

A serial, half-duplex data transmission protocol developed by AEG Modicon

 

 

MSB

Most Significant Byte

 

 

RS232

A standard for serial, full-duplex (FDX) transmission of data based on the

RS232 Standard

 

 

 

RS485

A standard for serial transmission of data based on the RS-485 Standard

 

 

RTU

Remote Terminal Unit

 

 

Minimum System Requirements

BAS system or computer with a serial or USB port with a converter to RS-485.

SYNC boiler equipped with Modbus communication board.

Shielded twisted pair communication cable.

2

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Lochinvar 1.0- 1.3- 1.5 operation manual Contents

1.0- 1.3- 1.5 specifications

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