Simply method of control a LED

[Thomas_Gull]

Hello I must be control a LED with Dasyalab 13 It mus signalise if the messurement is running I will dont use a Boeard with Relais, i Need a simply Methode. i have seen that is possible with the Serialport is possible control 1 ot 2 LEDs what are the methods to control one LED Simpli on Dasylab? Greetings Thomas

[CJ_Butler__DASYLab_Pro]

I don't know of a serial port LED.

You need a 2-5V output to turn on an LED typically. You should ensure that you protect the LED with a resistor.

Many data acquisition devices have Digital I/O. With DASYLab, simply configure your control signal (5V) to a Digital output for your device.

When I do DASYLab training, I use a Combi Trigger module for the control and output directly to a MCC USB-204 DO wired with an LED on signal and ground.

[hw70]

You can use the Script module to open a serial port. Turn on/off the RTS/DTR pins (4 and 7, DE-9) dependent on the incoming data value. The serial library is included in DASYLab's Python.

Code fragment of a Script module with inputs only:

import serial

...
    def Start (self):
        self.port = None
        try:
            self.port = serial.Serial(port = "COM1",
                                      baudrate = 9600,
                                      bytesize = 8,
                                      parity = serial.PARITY_NONE,
                                      stopbits = serial.STOPBITS_ONE,
                                      timeout = 0, 
                                      xonxoff = 0,
                                      rtscts = 0)            
        except:
            print "Unable to open COM1."
            return False
    #end Start
        

    def Stop (self):
        if self.port and self.port.isOpen():
            self.port.close()
    #end Stop


    def ProcessData (self):        
    ...
        InBuff = self.GetInputBlock(0) # NULL check omitted
        val = int(InBuff[0])
        InBuff.Release()

        if val == 0:
            self.port.setDTR(False) # <-- !
            self.port.setRTS(True)
        else:
            self.port.setDTR(True)
            self.port.setRTS(False)            
            
        
        return True
    #end ProcessData