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It explains how to configure and interface Modbus RTU implementations, while directing device-specific configuration details to separate user manuals. The document includes overviews of message framing and link/data layers, IEEE 32-bit floating-point register information, supported Modbus RTU function codes, and Modbus RTU exception codes. 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Contact your local sales office for warranty information. If warranted goods are returned to Honeywell during the period of coverage, Honeywell will repair or replace without charge those items it finds defective. The foregoing is Buyer's sole remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and fitness for a particular purpose. Specifications may change without notice. The information we supply is believed to be accurate and reliable as of this printing. However, we assume no responsibility for its use.  \nWhile we provide application assistance personally, through our literature and the Honeywell website, it is up to the customer to determine the suitability of the product in the application.  \nHoneywell Process Solutions  \n512 Virginia Drive  \nFort Washington, PA 19034  \nModbus is a registered trademark of MODICON, Inc.  \nWindows is an addressed trademark of Microsoft Inc.  \nThe omission of a name from this list is not to be interpreted that the name is not a trademark.  \nReference: Modicon Modbus Protocol Reference Guide-PI-MBUS-300 Rev. G  \n\n| About This Document\u003Cbr>Abstract\u003Cbr>This document provides generic information for Honeywell instruments implementing the Modbus RTU Serial Communications protocol. Configuration information relating to specific devices is supplied in separate user manuals. Refer to 1.2 Modbus RTU Configuration Interface for a list of instruments and the corresponding configuration interface user manuals.\u003Cbr>Contacts\u003Cbr>World Wide Web\u003Cbr>The following lists Honeywell’s World Wide Web sites that will be of interest to our customers.\u003Cbr>Honeywell Organization WWW Address (URL) |  |  |  |  |\n| --- | --- | --- | --- | --- |\n| Corporate\u003Cbr>Industrial Measurement & Control |  | [http://www.honeywell.com](http://www.honeywell.com)\u003Cbr>[http://www.honeywell.com/ps](http://www.honeywell.com/ps) |  |  |\n| Telephone\u003Cbr>Contact us by telephone at the numbers | listed below.\u003Cbr>Organization |  | Phone Number |  |\n| United States and Canada | Honeywell |  | 1-800-423-9883\u003Cbr>1-800-525-7439 | Tech. Support Service |\n\nRevision Information  \n\n| Document ID | Revision\u003Cbr>Number | Publication Date | Revision details |\n| --- | --- | --- | --- |\n| 51-52-25-66 | S | July 2010 | Register Maps updated for Extended Comms, Alarm Values and\u003Cbr>Alarm Status (X Series Recorders) |\n| 51-52-25-66 | T | February 2013 | Decimal registers updated |\n|  |  |  |  |\n\nContents  \n1. INTRODUCTION ................................................................................................... 1  \n1.1 Modbus RTU Implementation........................................................................................................ 1  \n1.2 Modbus RTU Configuration Interface ........................................................................................... 1  \n2. MODBUS RTU MESSAGE FORMAT ................................................................... 2  \n2.1 Modbus RTU Link Layer ............................................................................................................... 2  \n2.2 Modbus RTU Data Layer ............................................................................................................... 3  \n2.3 IEEE 32-bit Floating-Point Register Information .......................................................................... 4  \n3. MODBUS RTU FUNCTION CODES ..................................................................... 9  \n3.1 Function Code 01 – Read Digital Output Status .......................................................................... 13  \n3.2 Function Code 02 – Read Digital Input Status ...................","cbCainyI61U5FUSX","https://ap.wps.com/l/cbCainyI61U5FUSX","pdf",298069,76,"English","# About This Document\n## Abstract\n## Contacts\n# Revision Information\n# Contents\n## 1. Introduction\n## 2. Modbus RTU Message Format\n## 3. Modbus RTU Function Codes\n## 4. Modbus RTU Exception Codes\n## A. Appendix: Register Map","[{\"question\":\"What does the manual cover for Modbus RTU devices?\",\"answer\":\"It provides generic information for Honeywell instruments implementing the Modbus RTU Serial Communications protocol, while device-specific configuration is covered in separate manuals.\"},{\"question\":\"Where can users find Modbus RTU configuration interface information?\",\"answer\":\"It directs readers to the Modbus RTU Configuration Interface section and to a list of instruments and their corresponding configuration interface user manuals.\"},{\"question\":\"Which topics are included about Modbus RTU communication behavior?\",\"answer\":\"The document covers the Modbus RTU message format (link and data layers), IEEE 32-bit floating-point register information, Modbus RTU function codes, and Modbus RTU exception codes.\"}]","Modbus® RTU Serial Communications User Manual - Revision T - February 2013 | PDF",1792709649,192]