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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA CRMS (User Edition – Chapter 18: RS-232 Interface) Chapter 18: RS-232 Interface This chapter presents RS-232 interface information. The MicroTurbine Controller provides two serial ports for communication interface: User Port (9-pin) Maintenance Port (25-pin) Overview of RS232 Interface The operator may connect a computer (using a null modem adapter) or a modem (direct serial-to-serial cable) to either the maintenance port or the user port. A modem connected to the Maintenance Port or to the User Port, is detected automatically and configured for automatic answer by the Power Controller software as part of the configuration check during the power up sequence. The default hardware configuration for each port is 57,600 bits per second, 8-bit word length, no parity, and hardware handshake for flow control. User Serial Port Connector Pinouts The user port is a standard DB9 type 9-pin connector with the same pinouts as a Wintel computer serial port. The connector pinouts are presented in Table 18-1. In each case, the definition of “Input” or “Output” is from the Power Controller perspective, as detailed in Table 18-1. PC (or PLC) to MicroTurbine connection requires a “null modem” or cross-connection of RS-232 control signals. Null modem connections (PC to MicroTurbine) are shown in Figure 18-1. Table 18-1. User Serial Port Connector Pinouts Connection Name Value I/O Classification RS-232 Connector Pin 1 2 3 4 5 6 7 8 9 DCD (Data Carrier Detect) RxD (Received Data) TxD (Transmitted Data) DTR (Data Terminal Ready) GND (Signal Ground) DSR (DSE Ready) RTS (Request to Send) CTS (Clear to Send) RI (Ring Indicator) ± 12 Volts ± 12 Volts ± 12 Volts ± 12 Volts Ground (0 Volts) ± 12 Volts ± 12 Volts ± 12 Volts ± 12 Volts Input Input Output Output N/A Output Output Input Input Dry circuit Dry circuit Dry circuit Dry circuit Power Dry circuit Dry circuit Dry circuit Dry circuit 410013 Rev H (December 2008) Page 18-1 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 Capstone Remote Monitoring System (User Edition)
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