Chapter 2 Register Map and Descriptions
© National Instruments Corporation 2-3 6527 Register-Level Programmer Manual
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: 00 (hex) for Port 0
01 (hex) for Port 1
02 (hex) for Port 2
Type: Read-only
Size: 8-bit
Bit Map:
Bit Name Description
7–0 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
7 6 5 4 3 2 1 0
N.7 N.6 N.5 N.4 N.3 N.2 N.1 N.0
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