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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: ModBus Translator Module Write Registers Some write registers may be written into without entering a password. However, most do require password access in order to change the values. Write Registers 48001, 48003 – 48008, and 48021 – 48022 may be written without password access. All other Write Registers will require entering a valid password in register 48004 through 48008 before modifying a value. Successful entry of the password may be verified by reading back the value at register 40006 as 1, indicating protected password access has been granted. The paragraph below demonstrates how to enter a user password. Entering a User Password • Passwords may be no more than 9 characters (see Appendix A for character - hex translation) • An additional character is required for a NULL terminator (0x00) • Two characters make up one 16-bit register location • Passwords must be entered starting in location 48004 • Fill any remaining register bytes with NULL (0x00) The example below shows how to enter the default password: Register Location Byte Contents 48004 48005 48006 48007 48008 0x55h (“U”) 0x52h (“R”) 0x32h (“2”) 0x50h (“P”) 0x00 (NULL) 0x53h (“S”) 0x31h (“1”) 0x33h (“3”) 0x00h (NULL) 0x00h (NULL) Several write registers require multiple registers to be updated simultaneously in order to complete the operation. These registers will be identified with footnotes. All values written into the write registers can be read back using the standard ModBus read procedure. This allows verification that the value that was attempted to be written into a specific register, can be read back from that register. However, this value may be different from the value of the corresponding read register, which could happen if the host device does not or was not able to accept the command issued to it. In that case, the command value remains unchanged and the corresponding read register on the ModBus Translator would still contain the old value. 410040-001 Rev A (February 2003) Page 21 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. WARNING Several of the registers in this section access MicroTurbine commands that write to Non-Volatile Memory (NVM) locations. The NVM memory device has limited number of writes (10,000 writes) that can be executed before the device fails. All registers that apply (see below) are denoted with an asterisk (*) character preceding the description name.PDF Image | Technical Reference Modbus Translator Module
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