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
