Schaefer_K1979_Signals

5V and GND

Output:

  Input Pwr OK      Hi = Input Voltage OK
                    Lo = Input Voltage out of range
					
  DC Output OK      Hi = Output Voltage OK
                    Lo = Output Voltage out of range
					
  Over Voltage      Hi = Overvoltage shutdown is not activated
                    Lo = Overvoltage shutdown is tripped.  Latching Signal.		

  Over Temperature  Hi = Over temperature shutdown is not activated
                    Lo = Over temperature shutdown is tripped.  Latching Signal.
					
  Over Current      Hi = Over current shutdown not activated
                    Lo = Over current shutdown is tripped.  Latching Signal.
					
Input:

  Inhibit ( Remote On/Off Ctrl)  
  
                    Hi = Power supply is ON
		    Lo = Power supply is OFF
  
Function:

  A latched signal can be reset by cycling the remote On/Off control signal.  
  
3 May 2022

Convo w/ Dave French:

1  HDWRE Status lines should go thru opto-isolator then to R Pi AND front panel leds directly
1  Python

1  HDWRE Add a " heartbeat " status light  
     Change J2
	 
1  Python

1  HDWRE Add a front panel R Pi reset button

1  HDWRE Use a latching relay to control the K1979 ON / OFF
1  Python

1  HDWRE Use a second 5V p/s, diode OR'd for K1979 ON / OFF

15 May 2022

1  "ON CMD" LED should be fed from the relay, thru opto-isolator
1  signal " ON_CMD_LED " ( active high ) needs to go to the Raspberry Pi

2 Jun 2022

1 Change GPIO_ON ( 2 ) to 17  -- Header 11
1  Sch
1  PCB

1 Change GPIO_OFF ( 3 ) to 27 -- Header 13
1  Sch
1  PCB