Pcs2

Well, let's say you plug in a CD player. Normally with the power button off both outputs are open, when the players powered on, paused or stopped (system stby) output 2 makes/closes and output one stay open. When playing or FFWD/RWD output one makes/closes and output two opens. It may be reversed but I think that's right. So you basically have three possibilties to track: both open, one open & two closed or one closed and two open.

Two different ports.

Define_Device

dv_IO               = 5001:17:0  //  I/0 = PORT 9


DATA_EVENT   [dvCD]              ///send stop to cd player
{
    online:
    {
    pulse [dvCD,2]
    SEND_COMMAND dvCD,'SET MODE IR'         // sets IR port 9 to IR mode
    SEND_COMMAND dvCD,'SET IO LINK 1'       // sets IR port to link with I/O channel 1 (port 17)
    send_command dvCD, 'CARON'
    }
}

DATA_EVENT   [dv_IO]                 /// I/O sensor input port 17 of NI4000 ch 1 & 2
{
    online:
    {
	send_command dv_IO,'SET INPUT 1 LOW'
	send_command dv_IO,'SET INPUT 2 LOW'
	send_command dv_IO,'SET INPUT 3 LOW'
	send_command dv_IO,'SET INPUT 4 LOW'
    }
}

CHANNEL_EVENT[dv_IO,1]               ///  IO current sensor for play/ffwd-rewnd on cd
     {
    ON:
	  {
	  wait 3
	       {
	       if ([dv_IO,1]) 
		    nCDIO_PLAY   =  1        
	       }
	  }
    OFF:
	  {
	  wait 3
	       {
	       if (![dv_IO,1])
		    nCDIO_PLAY  =  0        
	       }
	  }
     }
CHANNEL_EVENT[dv_IO,2]               ///  IO current sensor for stop/pause on cd
     {
     ON:
	  {
	  wait 3
	       {
	       if ([dv_IO,2]) 
		    nCDIO_STBY  =  1        
	       }
	  }
     OFF:
	  {
	  wait 3
	       {
	       if (![dv_IO,2])
		    nCDIO_STBY =  0        
	       }
	  }
     }