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Add info about discovered DTMF modules and fix some numbering issues
!Function
|-
|'''P1P2-1'''
|GND
|-
|'''P1P2-2'''
|Output, goes to programming section
|-
|'''P1P2-3'''
|Input, goes to programming section
|-
|'''P1P2-4'''
|Output to Timer, thru diode customization section between decoders (CR5 & CR8)
|-
|'''P1P2-5'''
|From CR5 diode, test output? (N/C on main board)
|}
<br />
===DTMF Tone Decoders===
I recently became aware that at some point, CD&F made DTMF decoders that use the two tone decoder PCB and have a Norcomm NC401 module attached to them. The manual for the module can be [[:File:Norcommnc401.pdf|viewed here.]] Its based on an 8051 mcu and the classic MT8870 DTMF decoder IC. You can program various functionality and digit sequences into it.
<gallery>
File:Cdf_decoder_dtmf.jpg|An example of a DTMF decoder card
</gallery>
