ADLINK PCI-7442 - Manual (Page 45)

Register Format 33
4 Register Format
This chapter provides the detailed descriptions of the register for-
mats intended for programmers who want to operate the card
series through low-level programming. This chapter is intended for
users that have basic understanding of the PCI interface.
The PCI-7442/7443/7444 card registers are all 16-bit wide and
can only be accessed using 16-bit I/O instructions. The isolated
digital input/output control is by accessing registers mentioned in
this chapter.
4.1 PCI-7442 I/O Registers
Isolated Digital Input Register
There are 64 isolated inputs on a PCI-7442 card. The statuses of
the 64 lines can be read from the four isolated input registers.
Each bit corresponds to each channel. The bit value 1 means that
the input is ON and 0 means that the input is OFF.
Address R/W Value Mapping [MSB (bit15)----LSB (bit0)]
BASE+0x02h R IDI[15…0]
BASE+0x04h R IDI[31...16]
BASE+0x42h R IDI[47...32]
BASE+0x44h R IDI[63...48]
Bit value: 1: The input is ON
0: The input is OFF (Initial value)