I installed the pyepics package on princess_sparkle since this is much easier under Ubuntu than under CentOS.
sudo apt-get install python-dateutil python-setuptools
Then I started the following python script ~/start_test_channels.py in the background on princess_sparkle. The EPICS channels are actually in an IOC on tcs_daq. They are all acquired by the frame builder at 16Hz.
# a short script to output low frequency sine wave to EPICS channels
a = 0