B. Specifications
127
J4 (Parallel I/O)
J4 is a 50-pin (dual 25-pin) vertical male header with 0.1 inch contact spacing. The 24
general purpose parallel I/O signals are included in this connector. The pin assignments
are given in the “J4 Parallel I/O Pinout” table following. The pin assignments are chosen
for direct connection to an I/O module mounting rack, such as those offered by Ziatech
and Opto 22. The mating connector is a T&B Ansley #622-5030 or equivalent.
J4 Parallel I/O Pinout
Pin#
Signal
Type
Description
Pin#
Signal
Type
Description
1
MOD23
In/Out
Port 7A, bit 7
26
GND
------
Ground
2
GND
------
Ground
27
MOD10
In/Out
Port 79, bit 2
3
MOD22
In/Out
Port 7A, bit 6
28
GND
------
Ground
4
GND
------
Ground
29
MOD09
In/Out
Port 79, bit 1
5
MOD21
In/Out
Port 7A, bit 5
30
GND
------
Ground
6
GND
------
Ground
31
MOD08
In/Out
Port 79, bit 0
7
MOD20
In/Out
Port 7A, bit 4
32
GND
------
Ground
8
GND
------
Ground
33
MOD07
In/Out
Port 78, bit 7
9
MOD19
In/Out
Port 7A, bit 3
34
GND
------
Ground
10
GND
------
Ground
35
MOD06
In/Out
Port 78, bit 6
11
MOD18
In/Out
Port 7A, bit 2
36
GND
------
Ground
12
GND
------
Ground
37
MOD05
In/Out
Port 78, bit 5
13
MOD17
In/Out
Port 7A, bit 1
38
GND
------
Ground
14
GND
------
Ground
39
MOD04
In/Out
Port 78, bit 4
15
MOD16
In/Out
Port 7A, bit 0
40
GND
------
Ground
16
GND
------
Ground
41
MOD03
In/Out
Port 78, bit 3
17
MOD15
In/Out
Port 79, bit 7
42
GND
------
Ground
18
GND
------
Ground
43
MOD02
In/Out
Port 78, bit 2
19
MOD14
In/Out
Port 79, bit 6
44
GND
------
Ground
20
GND
------
Ground
45
MOD01
In/Out
Port 78, bit 1
21
MOD13
In/Out
Port 79, bit 5
46
GND
------
Ground
22
GND
------
Ground
47
MOD00
In/Out
Port 78, bit 0
23
MOD12
In/Out
Port 79, bit 4
48
GND
------
Ground
24
GND
------
Ground
49
VCC
------
+5 Volts
25
MOD11
In/Out
Port 79, bit 3
50
GND
------
Ground
