Summary

Installing USB Driver

PsychoPy includes Cedrus’ own pyxid library and requires the Virtual COM Port (VCP) driver in order to work. Follow the instructions on this page to download and install the driver:

Installing the USB Driver for Mac OS X

Verifying USB Driver Installation

You will need the Mac’s Terminal program.

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Open the Terminal program.

In Terminal, type the command:

This command will show a list of all available serial port devices.

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With your RB response pad (or Lumina, or StimTracker) connected to the computer, look for a listed device with something like “usbserial-xxxx” in the name, e.g. “/dev/cu.usbserial-00005014”. If present, then a USB driver is installed.

We still need to verify that this is the USB driver for the Cedrus device and not something else. To do so, unplug the response pad and type the “ls /dev/cu.*” command again. The USB driver should no longer be listed. If it is, then you have some other serial device connected.

Verifying Python Plug-in

We have written a small Python snippet that does not use pyxid and uses pyserial directly. It looks for the serial port, opens it, sends a command to verify that it’s an XID device, and then closes the serial port. The snippet should be used with PsychoPy Coder. You can open Coder by going to View menu and choosing Open Coder View.

Download ‘xid_pyserial_test_wip1.py’

Looking for XID devices...

XID Candidates:  ['cu.usbserial-0000202']

Trying port: Serial<id=0x1015f5090, open=False>(port='/dev/cu.usbserial-0000202', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=None, xonxoff=False, rtscts=False, dsrdtr=False)

Writing '_c1' to port

Read in '_xid0' from port

XID device found!

If the test program produces the “XID device found!” message, then this confirms that pyxid should be able to detect your response pad.

Having Trouble?

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Last revision: Aug 22, 2017