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Software Crestron SIMPL Windows Retriggerable One Shot Example: automatic power down Touchpanel OR fb115 fb116 fb117 fb118 fb119 press115 press116 press117 press118 press119 i1 i2 i3 i4 i5 fb120 fb121 press120 press121 i6 i7 fb122 fb123 fb124 fb125 press122 press123 press124 press125 i8 i9 i10 Retriggerable One Shot out out out* trig trig* reset pulse_time System_Active 3.00.00.00s Buffer One Shot 0 trig trig* out out* reset pulse_time 1 enable in1 in2 out1 out2 Screen_Up in3 out3 Lights_Off Vproj_Off 0.5s You can program a system to detect inactivity and power down the equipment automatically after a specified period of time has elapsed. The figure shown above is a program to do just this. Recall from the SIMPL Windows Programming chapter that time parameters can be expressed in the HH.MM.SS.XXs format, where: HH = hours, MM = minutes, SS = seconds, and XX = hundredths of a second. Thus in the above example the ‘pulse_time’ parameter of "3.00.00.00s" means 3 hours, 0 minutes, 0 seconds, and 0 hundredths of a second. When using this notation you can leave out the larger units if you are not using them, thus "3.00.00s" would mean 3 minutes, 0 seconds, and 0 hundredths of a second (it would NOT mean 3 hours). Note that an OR symbol is used to detect when a relevant button has been pressed, and each press will cause the Retriggerable One Shot symbol to be retriggered, thus starting the countdown over again. When 3 hours have passed with no buttons being pressed, ‘system_active’ will go low. The ‘system_active’ output is routed into the ‘trig*’ input of a One Shot symbol, which will detect the falling edge of the signal and activate its output accordingly. The "0" signal on the ‘trig’ input of the One Shot symbol is required whenever you only want to use ‘trig*’, due to the fact that the ‘trig’ input is a required (i.e., not optional) input. Placing a 0 here tells the symbol to ignore this input at all times. Delay Symbol The Delay symbol is used to postpone an event for a given amount of time. Basically the output signals will be exact replicas of the inputs (in terms of positive and negative transitions), but delayed by the appropriate amount of time. The Delay symbol also has a ‘reset’ input, which cancels any impending output events. At first glance you might think that the Delay symbol presents an easier way of building the auto-power-down example shown in the previous section using the Retriggerable One Shot symbol. However, two factors prevent you from using the Delay symbol in this application. First, the Delay is not retriggerable, but instead it 54 • Crestron SIMPL Windows Primer – DOC. 6253
