Technical Reference Modbus Translator Module

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

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: ModBus Translator Module Remapping ModBus Registers In some implementations, it may be desirable to re-map the ModBus register assignments. This may be done to “fill in the gaps” in the standard table, allowing for longer multi-byte read operations. It can be accomplished by using the following Relocate commands. 1. The commands to assign both read and write registers are MBASGN and MBSAVE and are available at the Capstone prompt (which is enabled by setting all address dip switches to "off" and connecting the RS232 program to the RS232 port). When new firmware is installed, the assignments are reset. A “batch” file can be created to load all the changes at once. The command MBASGN works as follows: MBASGN : lists all current assignments stored in memory (not NVM) MBASGN =0 : clears all current assignments in memory (does not Write to NVM) MBASGN =, : assigns default capstone register to new ModBus Address MBASGN =, 0: deletes ModBus assignment in memory – restore default MBASGN =: displays current assignment for specified ModBus Address – shows assigned default MBSAVE: saves current assignment list to NVM to be loaded on next boot 2. When a new ModBus address is assigned to a Capstone default register, that Capstone register will no longer be valid at its original address and may not be assigned to another ModBus address. In other words, it is not possible to have a Capstone default register (read or write) appear at more than one ModBus address; nor is it possible to have more than the original number of valid registers available at one time. 3. When re-assigning multi-word registers, only the first register location needs be assigned; the others will follow automatically. If an attempt is made to assign a register in the middle of a multi-word bank, a warning is generated and the command is ignored. For write registers, the multi-word banks are obvious, may be up to 6 words long, and are indicated as such in the documentation. For the read registers, the multi-word registers are only those returning pure 32-bit values and may only be 2 words long. To remap multi-word registers more than 2 words long, the user needs to reassign each word of the multi-word register. For ex., in case of the fault register, register 46002 will need to be remapped separately from register 46000, and that separately from register 46004, etc. 4. The MBSAVE command actually writes the assignment list from RAM to flash memory. The next time the ModBus controller is booted, the new assignments are loaded back into RAM and used. The MBASGN=0 command can be used to clear the RAM copy of the assignments; to reload the assignments from NVM use the REBOOT command. 5. By using the MBASGN command to list assignments and RS232 program's "W" command to save this to disk, a verified batch file for assigning the registers in a production situation can be created. 410040-001 Rev A (February 2003) Page 34 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. NOTE A register re-assignment map may become invalid after a software upgrade. The registers per the new software will need to be reassigned once again after an upgrade.

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