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Chapter 3
Signal Connections
Caution:
!
Programming
Mode
PC7
Mode 0
I/O
Mode 1 Input
I/O
Mode 1 Output
OBF
Mode 2
OBF
* Indicates that the signal is active low.
Digital I/O Signal Connections
PC-DIO-24/PnP User Manual
During programming, note that each time you configure any port, output
ports A and C are reset to 0, and output port B is undefined.
Table 3-2. Port C Signal Assignments
Group A
PC6
PC5
I/O
I/O
I/O
IBF
*
ACK
*
I/O
A
A
*
ACK
*
IBF
A
A
The following specifications and ratings apply to the digital I/O lines.
The maximum input logic high and output logic high voltages assume a
Vcc supply voltage of 5.0 V.
The absolute maximum voltage rating is –0.5 to +5.5 V with respect to
GND.
Digital input specifications (referenced to GND):
Input logic high voltage
Input logic low voltage
Input high current
(V in = 5 V, W1 set to pullup)
Input high current
(V in = 5 V, W1 set to pulldown)
Input logic low current
(V in = 0 V, W1 set to pullup)
Input logic low current
(V in = 0 V, W1 set to pulldown)
PC4
PC3
I/O
I/O
STB
*
INTR
A
A
I/O
INTR
STB
*
INTR
A
A
2.2 V min
–0.3 V min
3-4
Group B
PC2
PC1
I/O
I/O
STB
*
IBFB
A
B
B
ACK
*
OBF
A
B
B
I/O
I/O
A
5.3 V max
0.8 V max
—
11.0 A max
—
65 A max
—
–65 A max
—
–11 A max
© National Instruments Corporation
PC0
I/O
INTR
B
*
INTR
B
I/O
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