Technical Reference Modbus Translator Module (MOXA®)

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Technical Reference Modbus Translator Module (MOXA®) ( technical-reference-modbus-translator-module-moxa® )

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Modbus Translator Module Table 4 – Function Code 03 Response (Read Holding Registers) Byte Name Example Notes 1 Slave Address 01 2 Function Code 03 3 Byte Count 04 2 registers, 2 bytes each 4 Data high (42107) 5 Data low (42107) 00 Power Output = 00006AAAh = 27306 decimal 00 Applying the units conversion = 149,996 Watts 6 Data high (42108) 6A 7 Data low (42108) AA 8 CRC-16 low XX 9 CRC-16 high XX Preset Single Register (Function Code 06) This function writes to a single register. The command requires a Slave Address, Function Code, Start Address, Data, and CRC16. Attempting to write to a read-only register will cause an exception. The example shown in the table below shows how to set the Time of Use Event value at register 48507. Table 5 – Function Code 06 Command and Response (Preset Single Register) 1 Slave Address 01 2 Function Code 06 Byte Name Example Notes 3 Start address high 4 Start address low 3A 21 Time of Use Event at register 48507 (48507-40001 = 8506 = 213Ah) 5 Data high 6 Data low 05 7 CRC-16 low XX 8 CRC-16 high XX 00 Set Event to number 5 Preset Multiple Registers (Function Code 16) This function writes to one or more contiguous registers. The command requires a Slave Address, Function Code, Start Address, Register count, Byte count, Data, and CRC16. Attempting to write to a read-only register will cause an exception. The table below shows how to enter a Time of Use Event value at register 48507. 410078 Rev A (July 2009) Page 20 of 53 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or 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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