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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Modbus Translator Module Modbus Translator Operation After power is applied, if power source and connections are correct, the Ready LED will glow a steady green after a 25 to 30 second delay. During operation, the green P1 and P2 Tx LEDs will be on when transmitting data, and the yellow P1 and P2 Rx LEDs will be on when receiving data. Also, the LEDs on the LAN1 and LAN2 ports will be flashing if Ethernet communication on these ports is good. Refer to the following paragraphs for a general description of Modbus functions. Modbus Introduction A Modbus network consists of Modbus compatible devices connected in a daisy chain or straight line configuration using the RS-485 2-wire standard. A Modbus network consists of up to 32 devices with a maximum cable length of 1200 m (3937 ft). Modbus communication employs a Master to Slave method, in which 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 the 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. 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 are processed and responded to by the Modbus translator within 50 ms. Write commands sent to the Modbus translator are confirmed within 50 ms, but updates to the Capstone MicroTurbine System may not occur for up to 500 ms. 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, RS-232 Command column. ALLDAT is sent every one 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 Max 500ms 410078 Rev A (July 2009) 50 ms See Table 8 50 ms Max 500 ms 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. Page 16 of 53PDF Image | Technical Reference Modbus Translator Module (MOXA®)
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