Hi,
The only 5 pin rotary encoders I have encountered used 3 for 'encoder' part and the other 2 pins were for a momentary push button in the shaft; I haven't seen one that names a 'CLK' signal etc. I'm trying to see activity in the serial monitor. The encoder in question is an Accu-Coder.
http://www.clrwtr.com/PDF/Accu-Coder/Accu-Coder-960-Absolute-Encoders.pdfThank you in advance for any help.