camtronics 5a driver question

I'm slowly getting the driver assembled. I'm wiring the connector for
the computer as per the DXF drawing at http://206.19.206.56/parallel.htm
I'm also hooking up a relay as per the instructions at the bottom of the
page. What I was wondering is, where do I get the +5 volts from for the
limit/home switches and the transistor to control the relay? Am I
correct in thinking you can simply take the +5v from the +5v pin on one
of the 4 pin axis connectors on the PCB?

I hope this is clear enough, if not let me know and I'll try to provide
more info.

Al