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Publication Title | Technical Reference Modbus Translator Module

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth, CA 91311 Phone: (818) 734-5300 • Fax: (818) 734-5320 • Web Site:

Technical Reference Modbus Translator Module


This document provides hardware and software protocol interface definition for the ModBus Translator board, hereafter referred to as the ModBus Translator.

The ModBus Translator is an electrical device powered from a nominal 12 VDC source that provides data exchange between the RS-232 port of a Capstone MicroTurbine System and an RS-485 ModBus network. The ModBus uses a microprocessor to communicate with the Capstone MicroTurbine System to provide data over a RS-485 ModBus network.

All devices on a bus must operate according to the same electrical standards (RS-232 or RS- 485, not mixed). RS-232C standards specify that only two devices may be connected to a bus (i.e. only one slave is allowed). RS-485 specifications allow up to 32 devices (31 slaves) on a bus.

410040-001 Rev A (February 2003) Page 1 of 35

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.

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