Pin Connections and the Interface Module

The path from the instruments to the breadboard is provided by the Interface Module. This is a printed circuit board with a variety of different connectors and two short, single-row socket strips.

These are like the socket strips on the breadboard (five points connected together) except that instead of being connected just to themselves, the pins are also connected to the other connectors on the board.

Here's a closeup of the two halves of the socket strip (shown separately to fit the page better):

Pin Connections

Here's a table of what each breadboard pin is connected to:

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Pin	Signal	Function	Pin	Signal	Function
1	bnc1	J1-1 BNC 1	28	nc	No connection
2	bnc2	J1-2 BNC 2	29	Rx	receiver
3	bnc3	J1-3 BNC 3	30	nc	No connection
4	ph1l	J1-4 Phone Plug 1 left	31	nc	No connection
5	ph1r	J1-4 Phone Plug 1 right	32	nc	No connection
6	ph2l	J1-5 Phone Plug 2 left	33	nc	No connection
7	ph2r	J1-5 Phone Plug 2 right	34	nc	No connection
8	ph3l	J1-6 Phone Plug 3 left	35	nc	No connection
9	ph3r	J1-6 Phone Plug 3 right	36	nc	No connection
10	ear1	J1-7 Handset earpiece	37	nc	No connection
11	ear2	J1-7 Handset earpiece	38	nc	No connection
12	mic1	J1-7 Handset microphone	39	Tx	transmitter
13	mic2	J1-7 Handset microphone	40	nc	No connection
14	gnd	Ground	41	gnd	Ground
15	sound_mic	J2-1 microphone	42	ach0	input0
16	sound_spkrl	J2-1 speaker left	43	ach1	input1
17	sound_spkrr	J2-1 speaker right	44	ach2	input2
18	sound_lin_inl	J2-1 line in left	45	ach3	input3
19	sound_lin_inr	J2-1 line in right	46	ach4	input4
20	sound_lin_outl	J2-1 line out left	47	ach5	input5
21	sound_lin_outr	J2-1 line out right	48	ach6	input6
22	gnd	Ground	49	ach7	input7
23	ph4l	J2-2 Phone Plug 4 left	50	nc	No connection
24	ph4r	J2-2 Phone Plug 4 right	51	dac0	output 0
25	bnc1	J2-3 BNC 4	52	dac1	output 1
26	bnc2	J2-4 BNC 5	53	nc	No connection
27	bnc3	J2-5 BNC 6	54	nc	No connection