P2 Pinout

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