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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: ModBus Translator Module TABLE OF CONTENTS Section Title Introduction .............................................................................................................. 1 Hardware Interface...................................................................................................2 Power Requirements...............................................................................................................2 RS232 Connector....................................................................................................................2 RS-485 Connector...................................................................................................................2 Baud Rate Selector .................................................................................................................3 Address Selector .....................................................................................................................3 LED Operation.........................................................................................................................4 Environmental Specifications..................................................................................................4 ModBus Interface ..................................................................................................... 5 Description ...............................................................................................................................5 ModBus Address.....................................................................................................................5 Transaction Timing..................................................................................................................5 Data Format.............................................................................................................................5 ModBus Protocol......................................................................................................7 Introduction ..............................................................................................................................7 ModBus RTU Message Framing ............................................................................................7 ModBus RTU Message Content.............................................................................................7 ModBus Function and Exception Codes ................................................................................8 Supported ModBus Commands .............................................................................................9 Read Holding Registers (Function Code 03) ....................................................................9 Preset Single Register (Function Code 06).................................................................... 10 Preset Multiple Registers (Function Code 16) ............................................................... 10 Read Registers..................................................................................................................... 12 Write Registers ..................................................................................................................... 21 Loopback Diagnostic Test (Function Code 08) ................................................................... 29 Troubleshooting ..................................................................................................... 30 Test Modes .............................................................................................................32 Golden System..................................................................................................................... 32 Unit Under Test Mode .......................................................................................................... 33 Remapping ModBus Registers ............................................................................. 34 Capstone Technical Information...........................................................................35 410040-001 Rev A (February 2003) Page i This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. Page No.PDF Image | Technical Reference Modbus Translator Module
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