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Input Registers (Ports 0–2)
The Input Registers are read-only. Read an Input Register to get the logic state of the eight
optically isolated digital input lines on the corresponding port.
Address Offsets:
Type:
Size:
Bit Map:
7
6
N.7
N.6
Bit
7–0
© National Instruments Corporation
00 (hex) for Port 0
01 (hex) for Port 1
02 (hex) for Port 2
Read-only
8-bit
5
4
N.5
N.4
Name
Description
N.<7..0>
Data—These are the eight input data bits of input Port N,
where N is 0, 1, or 2, from bit 7 down to bit 0.
1 = Logic high: voltage and/or current present
0 = Logic low: voltage and/or current absent
Chapter 2
3
2
N.3
N.2
2-3
6527 Register-Level Programmer Manual
Register Map and Descriptions
1
0
N.1
N.0
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