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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. Read registers which may be updated with the ALLDAT command are indicated by an asterisk (“*”) following the RS232 command in Table 8. Two Modbus translator modes of operation are Stationary, “S” in Table 8, and Hybrid Electric Vehicle (HEV), “H” in Table 8. 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. NOTE The character “H” in the Mode column of Table 8 indicates both C30 and C60/C65 HEV. If the register does not apply to C30, it is noted by “N3” in parentheses. If the register does not apply to C60/C65, it is noted by “N6” in parentheses. NOTE Table 8 - Holding Registers (Read Only) Register Info Mode RS232 Command Timing (Sec) Description Representation General Communication 40001 S,H Selected Turbine (See Write Register 48001) 0 – This Turbine/Entire System 1 – Master Turbine 2 thru 10 – Specific Turbine TURBNO,0 1 40002 S,H Communication Status Bit 0 – Unable to establish communication with the MicroTurbine system (Error = 1) NA NA 40003 S,H Control Access 0 – Display 1 – User Port 2 – Maintenance Port CNTACC 10 40004 S,H Communication1 Configuration Bit 0 – 1: Mode Bits 0 = Stationary 1 = HEV 2 = CPS 3 = Reserved Bit 2 – 14: Not Used 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. 410078 Rev A (July 2009) Page 22 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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