Delta Tau PMAC2A-PC/104 manual Pin Connector

				PMAC2A PC104 Hardware Reference Manual
J2 (JTHW): Multiplexer Port Connector
(26-Pin Connector)					Front View
Pin#	Symbol	Function	Description		Notes
1	GND	Common	PMAC Common
2	GND	Common	PMAC Common
3	DAT0	Input	Data-0 Input	Data input from multiplexed accessory
4	SEL0	Output	Select-0 Output	Multiplexer select output
5	DAT1	Input	Data -1 Input	Data input from multiplexed accessory
6	SEL1	Output	Select -1 Output	Multiplexer select output
7	DAT2	Input	Data -2 Input	Data input from multiplexed accessory
8	SEL2	Output	Select -2 Output	Multiplexer select output
9	DAT3	Input	Data -3 Input	Data input from multiplexed accessory
10	SEL3	Output	Select -3 Output	Multiplexer select output
11	DAT4	Input	Data -4 Input	Data input from multiplexed accessory
12	SEL4	Output	Select -4 Output	Multiplexer select output
13	DAT5	Input	Data -5 Input	Data input from multiplexed accessory
14	SEL5	Output	Select -5 Output	Multiplexer select output
15	DAT6	Input	Data -6 Input	Data input from multiplexed accessory
16	SEL6	Output	Select -6 Output	Multiplexer select output
17	DAT7	Input	Data -7 Input	Data input from multiplexed accessory
18	SEL7	Output	Select -7 Output	Multiplexer select output
19	N.C.	N.C.	No Connection
20	GND	Common	PMAC Common
21	N.C.	Output	Buffer Request	Low is Buffer Request
22	GND	Common	PMAC Common
23	N.C.	Output	In Position	Low is In Position
24	GND	Common	PMAC Common
25	+5V	Output	+5VDC Supply	Power supply out
26	N.C.	Input	PMAC Reset	Low is Reset

The JTHW multiplexer port provides 8 inputs and 8 outputs at TTL levels. While these I/O can be used in unmultiplexed form for 16 discrete I/O points, most users will utilize PMAC software and accessories to use this port in multiplexed form to greatly multiply the number of I/O that can be accessed on this port. In multiplexed form, some of the SELn outputs are used to select which of the multiplexed I/O are to be accessed.

The direction of the input and output lines on this connector are set by jumpers E7 and E8. If E7 is removed or E8 is installed then the multiplexing feature if the JTHW port cannot be used.

62 Acc-2P Connector Pinouts