Advanced Power technologies TTC-1000 Instruction & Operation Manual
Also see for TTC-1000: Instruction & operation manualInstruction & operation manual
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V1.00, August 30, 2004745 TELEMETRY OPTIONSThis section will discuss the various telemetry options available, their use andany relevant settings. The TTC-1000 can be optionally equipped with eithercurrent loop outputs and a RS-485 DNP3.0 communications interface. All TTC-1000’s come equipped with a 9 pin DB-9 connector for RS-232 ASCIIcommunications. Temperature information can be retrieved through the RS-232interface.5.1 Analog OutputsThe 3 Probe Version of the TTC-1000 is currently unavailable with analogoutputs. This option will be a plug-in that will be available shortly.5.2 DNP3.0Units equipped with the optional DNP3.0 communications interface contain aplug-in Communications Processor module. The module contains a separatemicroprocessor to handle all overhead functions associated with the DNP3.0protocol without affecting operation of the transformer cooling control andmonitoring. The module contains either a half duplex or full duplex isolated RS-485 asynchronous communications interface capable of supporting multi-droptopologies. RS-485 interfaces differ from RS-232 in that RS-485 uses adifferential receiver and transmitter pair. This permits RS-485 links to send andreceive data over much greater distances as long as some simple rules arefollowed. See Section 3.7.3 for connections and jumper settings.After making the proper connections to the TTC-1000, there are only two settingsthat need to be made: Node Address and Baud Rate. Node Addresses can beany number from 0 to 65535. Please consult the DNP3.0 reference materials assome higher order addresses are reserved for broadcast messages.Baud Rates can be set to either 1200, 2400, 9600 or 19200. It is recommendedthat both Node Address and Baud Rate settings be made before attempting tocommunicate, however these settings can be changed “on-the-fly” withoutpowering down the TTC-1000.The TTC-1000 implements DNP3.0 Level 1 communications. This includes Class0 polls (Object 60 Variation 1) of analog and binary output points. The TTC-1000supports Object 1 Variation 2 binary outputs. Binary outputs include alltemperature and load set points along with the state of each output relay.Because Variation 2 is supported, the TTC-1000 communicates whether or notan output relay is under manual control by exerting the “forced” status bit forthese points only. The “forced” status bit is located in bit 4 of each binary outputoctet transmitted to the Master. For Analog Outputs, the TTC-1000 supportsObject 30 Variation 4. These are 16 bit signed analog quantities without status.Included in the Analog Output points are all temperatures equipped plus load |
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