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→Components: Some intel on U15.
|-
|2, 8, 18*, 24, 30
| +5VDC
|18 needs more research, may occasionally drop to ground?
|-
|12
|
|3.3v - 2.5KHz square wave (4msec p/p)
|-
|13
U13 - [http://web.archive.org/web/20200214104034/http://www.ti.com/lit/ds/symlink/cd4040b.pdf CD4040BPW]
U14 - [http://web.archive.org/web/20200214042837/http://www.ti.com/lit/ds/symlink/cd74hc4051.pdf CD74HC4051PWR] U15 - 92JK ZC5 (can't find much on this component)[[File:Screenshot 20200904-195417.png|thumb|92JK ZC5 chip noted as U15]]{| class="wikitable"|+!U15 Pin !Function!Observations/Notes|-|1|GND||-|2|5VDC||-|3||Rounded square wave (maybe sawtooth) alternating between 2msec and 4msec, resting at +3VDC between bursts|-|4||Rounded square wave alternating between 3msec and 5msec, short periods of 0v, resting at +3VDC between bursts|-|5||Data. Square wave. 5V space, 0v mark? Pulses around 250msec per bit.|-|6||More rounded square wave bursts|-|7|5VDC||-|8|3.3VDC||}
U16 - [http://web.archive.org/web/20190417163532/https://www.ti.com/lit/ds/symlink/lmv761.pdf LMV761]
