Teledyne 2103c installation and operation guide Modbus Ascii Address 1 Register Definitions

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2103 Modem Module

Section 4 Modbus Protocol

4.6Register Specifications All numbers in the Modbus registers are stored most significant byte first. If the polling device has a byte ordering of least signif- icant byte first (an Intel-based PC, for example), the bytes will need to be reversed after they are received.

The Modbus ASCII address is used to index the data by modules.

Modbus ASCII address 1 contains information related to the site. The first register contains a 16-bit integer count of the number of modules that have data to report. The maximum number of modules that can be supported is 4.

Modbus ASCII addresses 2 through the number of modules plus 1 contain data from the individual modules.

The Modbus ASCII addresses will be sorted by the model number, and then by module name, which is entered by the user through Flowlink. This allows the user to control the ordering of the addresses and easily predict what data will be in specific reg- isters.

Every measured parameter has a corresponding status and mea- surement time that are updated with each measurement.

The maximum number of supported measurements from all modules in the system is 28.

The Modbus registers are assigned within 30 seconds after the 2100 module is powered up. To conserve power for the users who do not use Modbus communications, no Modbus registers will be updated with sensor readings until a Modbus master communi- cates with the 2100 module.

The register definitions for the Site Information device (Modbus

ASCII address 1) are in Table 4-1below:

Table 4-1 Modbus ASCII Address 1 Register Definitions

	Register	Name	Data type	Units	Read/Write
	Number(s)	Name	Data type	Units	Read/Write
	Number(s)
	1	Number of	16 bit integer	None	Read
		modules (N)
		(1-4)

	2-20	Site name	38-byte string	None	Read

4-6

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Contents 2103/2103c Modem Module Page Foreword Page Table of Contents Modem ModuleAppendix a Replacement Parts Appendix B AccessoriesAppendix C Material Safety Data Sheets List of FiguresIntroduction Introduction Product DescriptionIdentifying Module Components 2103 Modem Module Components Top View2103 Modem Module Components Bottom View 2103 Modem Module Technical Specifications 2103 Communication Connector Pins Only Safety Symbols and Hazard Alerts 2103 Modem Cable ConnectorTechnical Service Modem Module Introduction Unpacking Instructions Installation and OperationSafety Installation Modem Module Installation and OperationTelephone Line Connection 2103 only 2103 Modem is in compliance with FCC part 68 rules. HoweverService is subject to state tariffs Modem Cable Connecting to Flowlink Flowlink Connect ScreenPushed Data Capability Modem Module Installation and Operation Antenna Options 2103c Cellular Modem ModuleOverview Programming Modem Module 2103c Cellular Modem ModuleSetting dialout phone numbers and alarm conditions TAP Service Parameters Modbus Protocol OperationEstablishing Configurations Configuration Example Direct Connection ShownGlossary of Terms Common Acronyms Modbus Ascii Address 1 Register Definitions Modbus Ascii Address 2-N+1 Register Definitions 117 Volume 1 status code Bit integer Read Measurement Parameters by Model Number Modem Module Modbus Protocol Maintenance Kit MaintenanceMaintenance Overview Desiccant DesiccantHydrophobic Filter Rings Modem Module Maintenance Appendix a Replacement Parts Replacement Parts1 2103 Replacement Parts Modem Module Appendix a Replacement Parts Modem Module Appendix a Replacement Parts 2 2103c Replacement Parts Modem Module Appendix a Replacement Parts Modem Module Appendix a Replacement Parts Modem Module Appendix a Replacement Parts Modem Module Appendix a Replacement Parts Modem Module Appendix a Replacement Parts Modem Module Appendix a Replacement Parts Modem Module Appendix a Replacement Parts Appendix B Accessories How to Order General AccessoriesModem Module Appendix B Accessories Appendix C Material Safety Data Sheets Material Safety Data Sheet Health Hazard Data Material Safety Data Sheet First Aid Measures Exposure Controls/Personal Protection Toxicological Information Other Information Declaration of Conformity Page Control and Laboratory use Page Teledyne Isco One Year Limited Factory Service Warranty