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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: ModBus Translator Module Baud Rate Selector An 8-position rotary switch is made available on the board for the purpose of selecting the baud rate communicated on the RS-485 ModBus link. See the table below for definition of position vs. baud rate selected. Note position 7 is “no parity” while all others are “even parity”. Position Baud Rate (bps) 0 1 2 3 4 5 6 7 Address Selector 2400-E-8-1 4800-E-8-1 9600-E-8-1 14400-E-8-1 19200-E-8-1 28800-E-8-1 38400-E-8-1 9600-N-8-1 NOTE: Baud rate is set for 28800 bps. On the side of the ModBus Translator, there is an 8-position DIP switch that appears as shown: Each device in an RS-485 ModBus network must have a unique 8-bit address from 1 to 247. To set the Capstone ModBus Translator address, set the DIP switches to a unique 8-bit number. Flipping the switches up corresponds to a Logic-1, or “ON”. Flipping the switches down corresponds to a Logic-0, or “OFF”. Each of the bit positions is numbered such that switch number one is assumed to be the MSB of the 8-bit address. Remember that for a RS-485 ModBus network to work, every device on the bus MUST have a different 8-bit address. An example for setting a ModBus address is shown below. Address Switch Number (Bit) 1 (7) 2 (6) 3 (5) 4 (4) 5 (3) 6 (2) 7 (1) 8 (0) 147 (93h) ON OFF OFF ON 90 (5Ah) OFF ON OFF ON 410040-001 Rev A (February 2003) OFF OFF ON OFF ON ON ON OFF Page 3 of 35 O12345678 N 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.PDF Image | Technical Reference Modbus Translator Module
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