P2 Pinout

Pin	Function
18	+5V
23	-nc-
25	-nc-
27	-nc-
22	Blue left TTL
30	Blue right TTL
16	Cable sense input
6	GND
7	GND (Serial)
26	Green left TTL
34	Green right TTL
21	P3-2 (usb)
19	P3-3 (usb)
13	Pin 1 analog
15	Pin 10 analog
11	Pin 12 analog
12	Pin 4 analog
8	Pin 5 analog
10	Pin 6 analog
14	Pin 7 analog
17	Pin 9 analog
20	Q4 gate
28	Red left TTL
36	Red right TTL
5	Serial CTS
9	Serial RTS
3	Serial Rx
1	Serial Tx
29	Trigger out TTL (U21 Port E.2)
31	U26-2 (spare TTL out)
2	USB opto+
4	USB opto-
33	White left TTL
35	White right TTL
24	Yellow left TTL
32	Yellow right TTL

Note: The analog signals listed above are not active by default. They can be activated internally by adding 1206 SMT resistors in eight places (one for each signal). This is done this way to protect the internal circuitry from damage that could result if an external connection is made to this port which drives the pin as an input. (Only high impedance inputs should be connected to the analog pins.)