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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Modbus Translator Module Table 2 – Error Code Value Definitions Code Name Meaning 1 2 4 6 Illegal Function Illegal Data Address Slave Device Failure Slave Device Busy Master command contained an unrecognized function code. Starting address is illegal. Note that some registers are read-only. Some internal self-test of the device has failed. Not communicating with MicroTurbine system 3 Illegal Data Value Either the register count is invalid or an attempt to write an illegal register value was found. Note this can be caused by attempting to write fewer registers than are required for an operation. Supported Modbus Commands The Modbus supports one read and two write commands. Example transmissions are provided with the definition of each command below. Read Holding Registers (Function Code 03) This function reads a single or multiple holding register values. The command requires a Slave Address, Function Code, Start Address, Register Count, and CRC16. Attempting to read a non-existent or write-only register will cause an exception. The example shown in the table below shows how to read the system Power Output value starting at register 42107 and ending with 42108. Table 3 – Function Code 03 Command (Read Holding Registers) 1 Slave Address 01 2 Function Code 03 Byte Name Example Notes 3 Start address high 08 Power Output at register 42107 (42107- 40001 = 2106 = 083Ah) 4 Start address low 3A 5 Register count high 00 6 Register count low 7 CRC-16 low XX 8 CRC-16 high XX 02 Read 2 registers total 410078 Rev A (July 2009) Page 19 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.PDF Image | Technical Reference Modbus Translator Module (MOXA®)
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