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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: ModBus Translator Module ModBus Interface Description The ModBus network is a “MASTER” to “SLAVE” network; that is to say, one node asks a question and a second node answers. A NODE is a ModBus device that is connected to the network. All communication is initiated selectively by the “MASTER” to other nodes by assigning each SLAVE NODE a unique address in the range of 1 to 247. Address 0 is a BROADCAST ADDRESS that can be used with certain ModBus functions to allow the MASTER to address all SLAVE NODES at one time. This device does not respond to BROADCAST messages. ModBus Address Each ModBus device responds to a single ModBus address. The address is in the range of 1 to 247, and each device must have a unique address. Transaction Timing Commands shall be processed and responded to by the ModBus Translator within 50ms. Write commands sent to the ModBus Translator are confirmed within 50ms, but updates to the Capstone MicroTurbine System may not occur for up to 500ms. Read registers are updated by a polling operation in the converter. Several read registers may be updated by the ALLDAT command and are designated with an asterisk (*) in Table 8, RS232 Command column. ALLDAT is sent every 1 second. Other Read registers are updated in a “round robin” fashion at varying time intervals designated in the following table. Whenever a Write command is sent, the MicroTurbine will respond, causing certain Read registers to update. This will occur within 500ms in all cases. Read Timing: 1 Response from Translator: 2 Read Register update from MicroTurbine: Write Timing: 1 Response from Translator: 2 Response time from MicroTurbine: 3 Update to Read register in Translator Data Format 50ms See Table 8 50ms Max 500ms Max 500ms Information regarding states and measurements made by the MicroTurbine are placed into a set of holding registers (4XXXX). Registers are defined as READ ONLY (less than or equal to 47999) or WRITE and READ (greater than 48000) registers. 410040-001 Rev A (February 2003) Page 5 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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