Advantech SPC-57 user manual

17	DI 5*	Digital input bit 5.
18	DO 5*	Digital output bit 5.
19	DI 6*	Digital input bit 6.
20	DO 6*	Digital output bit 6.
21	DI 7*	Digital input bit 7.
22	DO 7*	Digital output bit 7.
23	GND
24	VCC3P3
25	SPK_OUT_RP	positive port of right channel
		speaker-out function
26	SPK_OUT_RN	negative port of right channel
		speaker-out function
27	SPK_OUT_LP	positive port of left channel
		speaker-out function
28	SPK_OUT_LN	negative port of left channel
		speaker-out function
29	LINE_OUT_RP
30	LINE_OUT_LP
31	AC97_AGND
32	AC97_AGND
33	LINE_IN_L	left channel of audio line-in port
34	LINE_IN_R	right channel of audio line-in port
35	MIC_IN	audio microphone-in port
36	AC97_AGND
37	nUART3_DCD
38	UART3_RXD
39	UART3_TXD
40	nUART3_DTR
41	GND
42	nUART3_DSR
43	nUART3_RTS
44	nUART3_CTS
45	nUART3_RI
46	VCC_UART3	+5V
47	nRESET_OUT
48	MODE	reserved for future use. pull-high by
		100K resistor.
49	nUART2_DCD
50	UART2_RXD
51	UART2_TXD
52	nUART2_DTR
53	GND
54	nUART2_DSR
55	nUART2_RTS
56	nUART2_CTS
57	nUART2_RI
58	VCC_UART2	+5V

*Warning! Be careful when these DI/DO are used. Surge or over voltage may damage

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