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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: ModBus Translator Module Troubleshooting In the event that there is a ModBus problem, attempt the following solutions provided below: Symptom: Cannot communicate with the device through the ModBus Translator. Solutions: • Verify that the ModBus Translator Power Indicator light is ON. • Verify that the device that the ModBus Translator is hooked to (MicroTurbine) is powered up. This can be verified by looking for lights on the display panel. • Verify that the DB-9 serial cable from the MicroTurbine is properly plugged into both the Turbine unit, and the ModBus Translator. • Verify that the Data Activity Indicator light on the ModBus Translator blinks occasionally. • Verify that the RS-485 Bus wires are properly terminated, and the screws tightened into terminals 2 and 3 of the ModBus RS-485 connector. The A-Bus wire MUST connect to Terminal 3, and the B-Bus wire MUST connect to Terminal 2. • Change the ModBus Translator to a different address. • Change the baud rates of the entire system to a slower baud to verify. It is possible that by adding a new node to the RS-485 system, a previously achieved baud rate can no longer be supported. This occurs because the length of the cable and number of nodes may have changed. Symptom: The Power Indicator light on the ModBus Translator is not ON. Solutions: • Verify that the power is correctly hooked to the ModBus Translator. The positive (+) power wire MUST hook to Pin-4. The negative (-) power wire MUST hook to Pin-5. NOTE If these wires are hooked up backwards, permanent damage to the ModBus Translator could occur! • Verify with a voltmeter, that the voltage at power terminals is DC, and is between +6.0V and +25.0V. Symptom: The Data Activity Indicator light on the ModBus Translator is not lit. This light should never be solidly ON, but should blink ON and OFF periodically. When this light blinks, it shows that a valid ModBus command was received on the RS-485 Bus. Solutions: • Verify that the Power Indicator light is ON. The Data Activity light will not work if there is inadequate power to the ModBus Translator. • Verify that the baud rate selector switch is set to the same baud rate your ModBus master system is communicating. If data rates are not the same, bit timing will be off and data will not be understood properly by the ModBus Translator. • If there are still communications problems, then either the address should be changed, or the host device connected to the ModBus Translator over the DB-9 connector is not communicating. 410040-001 Rev A (February 2003) Page 30 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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