• PsychoPy has a built-in python library to drive the LabJack DAQ device. By default, PsychoPy uses the address for the “EI0” DB15 pins (address = 6008). We use the “FIO” terminal blocks so we need to specify the correct address (6000). In order to use the “FIO” terminal we need to add the following custom code component to the beginning our Builder experiment. PsychoPy users thread.

def mySetData(self, byte, endian='big', address=6000): 
        if endian=='big':
            byteStr = '{0:08b}'.format(byte)[-1::-1]
        else:
            byteStr = '{0:08b}'.format(byte)
        [self.writeRegister(address+pin, int(entry)) for (pin, entry) in enumerate(byteStr)]
labjacks.U3.setData = mySetData

• There seems to be a bug in Builder that results in an attribute of the p_port not being initialized. Running an experiment with LabJack digital codes that was built in Builder will give the following error.

AttributeError:'U3' object has no attribute 'status'

This can be fixed by adding the following code to the start of the script (anywhere after the code that imports the LabJacks module)

p_port.status = NOT_STARTED

Alternatively, you should be able to fix this problem by using the custom code component, selecting the Begin Routine tab, and adding the following“

p_port.status = []

• The LabJacks will initialize with all bits set to hight (i.e. sending a 255 code). So you should also add the following code to your script (it can be added right after the code shown above).

win.callOnFlip(p_port.setData, int(1), address=6000)