P2 Pinout

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

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.)