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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: MicroTurbine Communications Minimum Segment Length The minimum segment length of thin wire 10B2 cable is 0.5 meters or 1.64 feet. MAU Requirements (Connections) Up to 30 connections (Medium Attachment Units or MAUs) are allowed per Ethernet segment. For larger LAN’s, repeater hubs are required. Each repeater connection requires a MAU that must be counted toward the total of 30 MAU connections per segment. Wireless Modems For remote MicroTurbine installations where no landline telephone service is available, a radio or cellular modem is highly recommended for monitoring and troubleshooting the MicroTurbine system. Several third-party cellular and radio modems have been successfully used with the Capstone MicroTurbines. Connections to Third-Party Modems The following paragraphs present connection details between the MicroTurbine and the third-party modems. Modem Power The modem can be powered from the power supply available in the UCB box (see Figure 1, TB1 and TB2, and Figure 2, J16). Make sure the current rating of the modem does not exceed that of the power supply. Communications Cable The modem can be connected to the User Port or Maintenance Port of the MicroTurbine. Typically, it is connected to the Maintenance Port. A straight-through serial cable is required in most cases for data connection between the modem and the MicroTurbine. See the Serial Communications section for the connector pin assignments. Modem and MicroTurbine Settings The MicroTurbine port speed setting must be set to the same speed as the modem. The default hardware configuration for the User and Maintenance Ports is 57,600 bits per second (maximum speed), 8-bit word length, no parity, one stop bit, and hardware handshake for flow control. It is recommended to use the highest speed available on the modem, not exceeding the maximum speed of the MicroTurbine port. Upon initialization, the MicroTurbine sends an AT&F command to restore the factory settings of the modem. If this affects the desired settings on the modem, the modem can be powered on by a delay timer of at least two minutes after the MicroTurbine wakes up. In this case, the modem should be configured independently though a HyperTerminal session or using the modem’s PC software. Some telemetry modems have different modes for data packet transmission. For the MicroTurbine to communicate properly, the transmitted data packets should never be split. For example, the Integra-H modem flow control should be set to DOX mode, by which the data packets are kept together during transmission. 410042-001 Rev A (February 2004) Page 9 of 10 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 MicroTurbine Communications
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