J2 (jthw): multiplexer port connector – Delta Tau PMAC2A-PC/104 User Manual
Page 68
PMAC2A PC104 Hardware Reference Manual
62
Acc-2P Connector Pinouts
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.