As much as I like the Hottop roaster (I wrote the manual and am the Hottop webmaster, creating all the Hottop USA website content and layout), I NEVER liked the "P" control panel. It may suit the needs of some users, but I found it counter-intuitive to the way my brain works and my style of usage. I did not like the loss of time in a segment if a segment is programmed less than its three minutes, and the binary control of the heating element the system uses. The nature of these forums tends to draw enthusiasts who want as much control as possible, but still, I cannot ever remember recommending the "P" model. With that said...
If you really want control over that machine, here's what I recommend:
HTC+TC4 combination boards - (http://www.mlgp-llc.com/htri/index.html
Owners manual at: http://www.mlgp-llc.com/htri/pdf/HTRI-U...e-v100.pdf
RoastLogger (software) - http://homepage.ntlworld.com/green_bean...logger.htm
RoastLogger manual: http://homepage.ntlworld.com/green_bean...Manual.pdf
I have been using this system for the last 25 or so roasts I have done and cannot imagine going back to "B" panel control, as good as it was. I created both user manuals, but receive no benefit from their use. Particularly for "D" and "P" owners, I highly recommend this after-market add-on.