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Chapter 2. standard register assigments, 1 introduction, 1 input registers – AERCO Modbus Communications Manual User Manual

Page 13: 2 holding registers, Modbus, Communication

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Chapter 2

MODBUS

Communication

GF-114

Standard Register Assignments

USER MANUAL

OMM-0035_0C

05/18/12 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

Page

13 of 200

CHAPTER 2. STANDARD REGISTER ASSIGMENTS


2.1 INTRODUCTION

This Section provides the standard data register addresses assigned to the AERCO and C-

More Boiler Controllers, the AERCO Boiler Management System (BMS/BMS II), and AERCO

Control System (ACS). These data registers consist of Input Registers and Holding Registers.

All register addresses provided throughout this manual are expressed as hexadecimal numbers.

2.1.1 Input Registers

The Input Registers for the AERCO C-More Boiler Controllers and AERCO BMS/BMS II/ACS

are intended for information and functions that cannot or should not be controlled remotely.

Therefore, unless otherwise specified, ALL Input Register data are READ ONLY.

IMPORTANT

All Modbus addresses specified in this manual are written

generically in decimal/hexadecimal format. However, many

Building Automation Systems utilize another form of addressing

where:
40001 is added to the generic address for a Holding Register

address.

And

30001 is added to the generic address for an Input Register

address. Be sure to check the addressing scheme being used by

the BAS that is being interfaced to the XPC Gateway.

2.1.2 Holding Registers

The Holding Registers for the AERCO C-More Boiler Controllers and AERCO BMS/BMS II/ACS

are intended for information and functions that can be read or written (R/W). Therefore unless

otherwise specified, all Holding Register data are R/W.

CAUTION

DO NOT write in any Register Addresses marked as “Reserved” in

the Input Register and Holding Register Tables which follow.

Failure to observe this precaution may result in unstable

operation.