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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Modbus Translator Module 3. Connect the Modbus translator RS-485 port P2 to the Modbus network as follows: a. Connect the nine-pin end of the DB9F-to-TB connector (527458-001) to connector P2 on the Modbus translator. b. If necessary, connect a 121-ohm resistor between R+(D+) terminal 3 and R1-(D-) terminal 4 on the terminal block end of the DB9PF-to-TB connector. c. Connect the Modbus A wire to R-(D-) terminal 4 of the DB9PF-to-TB connector. d. Connect the Modbus B wire to R+(D+) terminal 3 of the DB9PF-to-TB connector. e. Connect the Modbus A and B wires to the applicable connectors on the next Modbus device. 4. To configure/monitor the Modbus translator, connect it to a PC using one of the options below. a. Use a cross-over Ethernet cable to connect the Modbus translator’s LAN1 RJ45 connector directly to the PC’s Ethernet connector. b. Use a straight-through Ethernet cable to connect the Modbus translator’s LAN2 RJ45 connector to a network switch or hub. A Modbus/RTU network requires a 121-ohm resistor on both ends of the daisy-chain network. This means that if a Modbus device is connected to only one other Modbus device, it must have the terminating resistor. However, if a Modbus device is connected to two other Modbus devices, it does not need the terminating resistor. NOTE 410078 Rev A (July 2009) Page 13 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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