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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: ModBus Translator Module Read Registers All read registers associated with a write register shall be updated within 500ms of a successful ModBus write operation. This provides time for the device to issue an RS-232 operation with the MicroTurbine system and verify the change has occurred. NOTE Read registers which may be updated with the ALLDAT command are indicated by an asterisk (“*”) following the RS232 command in the table below. Two modes of operation for Stationary and Hybrid Electric Vehicle (HEV) applications are provided with the ModBus Translator. These modes are mutually exclusive. Another mode of operation, for connections to a Capstone Power Server (CPS) is also provided. By selecting either mode (Write Register 48021), the system will provide different command options as described in the table below. Table 8 - Holding Registers (Read Only) General Communication Info Register Mode Description Representation RS232 Command Timing (Sec) 40001 S,H 40002 S,H 40003 S,H 40005 S,H 40006 S,H 40007 Selected Turbine (See Write Register 48001) Communication Status Control Access Comm Timeout Period2 Password Access Level ModBus Translator Software Version 0 – This Turbine/Entire System 1 – Master Turbine 2 thru 10 – Specific Turbine Bit 0 – Unable to establish communication with the MicroTurbine system (Error = 1) 0 – Display 1 – User Port 2 – Maintenance Port Units: 1 = 1 Seconds 0–Base 1 – Protected Encoded (xx.yy) where, High Byte - (xx) Low Byte - (yy) TURBNO,0 1 NA NA CNTACC 10 NA On Reg 48022 Update NA NA (prompt feedback) NA NA 40004 S,H Communication Configuration1 Bit0–1:ModeBits 0 = Stationary 1=HEV 2=CPS 3 = Reserved Bit2–14:NotUsed Bit 15: Comm Timeout Enable NA On Reg 48021 Update 1 User selects which mode of operation the ModBus Translator operates. Setting Bit 15 Comm Timeout Enable will cause a STRCMD=0 to be transmitted to the MicroTurbineTM system when a ModBus command has not been received within time defined by the Comm Timeout Period (addr 40005) and Start Command (addr 40101) is “Start”. Default setting is 0000h. 2 Function is enabled when bit 15 of register 40004 is enabled. Default Comm Timeout Period is 10 seconds (can be changed at addr 48022). If the Comm Timeout Period setting exceeds 5 minutes, then the Comm Timeout Enable function will not work. 410040-001 Rev A (February 2003) Page 12 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.PDF Image | Technical Reference Modbus Translator Module
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