P2 Pinout

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

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.)