Kantronics KPC–3 Plus User Manual
Also see for KPC-3 Plus: User guideUser guideManual
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Contents
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140Remote Sensing and ControlExample: controlling the level of liquid in a tankAs noted earlier, the Command Reference section and the ADVANCEDINSTALLATION section provide details needed to adapt these broad capacities to yourown situation, with your own sensors, controls, and remote locations.Modem ModeIn MODEM mode, the TNC demodulates the audio signal from the radio on port 1 andpasses this data through to its RS232 port unmodified. No ―protocol‖ adjustments aremade to the data; the TNC simply acts as a dumb modem. In other words, it simplyreflects out the RS232 port what it ―sees‖ coming in the radio port. For example, if ASCIIinformation is received at 1200 baud, the TNC presents your computer with ASCII at1200 baud. With a simple terminal program running at 1200 baud too, you‘d be able tocopy the text.To place the TNC in modem mode use the INTface command. At the cmd: prompt, typeINT MODEM and return. Then turn your TNC power OFF and back ON.To leave modem mode, send three Ctrl+C (command) characters to the TNC at 1200baud. If ABAUD was set to something other than 1200, that setting will remain after youexit modem mode. Hence it may be convenient for you to set the TNC to 1200 baudbefore entering modem mode.Note: Some computers may lose some of the data stream if a full RS232 cable isused. This can occur because the RS232 CD line, which is ―tied‖ to the TNC‘sreceive LED, may be cycling up and down. In this case, set CD to EXTERNALbefore entering INT MODEM.OPERATING RULES for controlling the level of the liquid:1. If the level is "low" or less, turn the Pump ON.2. If the level is "full" or more, turn the Pump OFF.3. If the level is "too full" or more, OPEN the Drain.4. If the level is "full" or less, CLOSE the Drain.CentralKantronicsTNC BasedStationRemoteKantronicsTNC BasedStationradioconnectionbetween TNCsPressureSensorLIQUIDPumpDrainToo FullFullLowTankControl line 1 (ON/OFF)Control line 2 (OPEN/CLOSE)A/D sensor line 1 |
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