Appendix B
I/O Connectors
© National Instruments Corporation
B-5
ER-8/16 User Manual
26-Pin Internal Connectors
+5 V
1
2
GND
+5 V
3
4
GND
+5 V
5
6
GND
+5 V
7
8
GND
PA7
9
10
PB7
PA6
11
12
PB6
PA5
13
14
PB5
PA4
15
16
PB4
PA3
17
18
PB3
PA2
19
20
PB2
PA1
21
22
PB1
PA0
23
24
PB0
+5 V
25
26
GND
+5 V
1
2
GND
+5 V
3
4
GND
+5 V
5
6
GND
+5 V
7
8
GND
PC7
9
10
PD7
PC6
11
12
PD6
PC5
13
14
PD5
PC4
15
16
PD4
PC3
17
18
PD3
PC2
19
20
PD2
PC1
21
22
PD1
PC0
23
24
PD0
+5 V
25
26
GND
a. 26-Pin IN Connector
b. 26-Pin OUT Connector
Figure B-3. 26-Pin Internal Connectors
Table B-3. 26-Pin IN Connector Pin Descriptions
Pin
Signal Name
Description
10, 12, 14,
16, 18, 20,
22, 24
PB<7..0>
Port B Channels 7 through 0—Each of these pins controls
the relay channel. A digital high on these pins connects the
COM contact of a channel to the NO contact of that channel.
A digital low on these pins connects the COM contact of a
channel to the NC contact of that channel.
9, 11, 13,
15, 17, 19,
21, 23
PA<7..0>
Port A Channels 7 through 0—Each of these pins controls
the relay channel. A digital high on these pins connects the
COM contact of a channel to the NO contact of that channel.
A digital low on these pins connects the COM contact of a
channel to the NC contact of that channel.
2, 4, 6, 8,
26
GND
Ground—These pins are connected to the internal ground on
the ER-8/16.
1, 3, 5, 7,
25
+5 V
+5 VDC supply—These pins are connected to the internal
(INT) +5 VDC supply on the ER-8/16.
