User manual

27 PCI-1761 User Manual

Appendix C Register Structure and Format

C.3 C . 3 R e l a y I / O R e g i s t e r s - B A S E + 0 H

The PCI-1761 offers 8-ch relay actuators. These I/O channels use the input and out-

put ports at addresses BASE+0H.

C.4 Isolated Digital Input Registers - BASE+1H

The PCI-1761 offers 8-ch isolated digital input channels. These channels use the

input ports at addresses BASE+1H.

C.5 Board ID - BASE+2H

The PCI-1761 offers Board ID register BASE+2H. With correct Board ID settings,

user can easily identify and access each card during hardware configuration and

software programming.

BD3 ~ DB0 Board ID

BD0 LSB of the Board ID

BD3 MSB of the Board ID

Table C.2: Register for Relay Output Status

Read Relay Output Status

Bit # 76543210

BASE +0H RS7 RS6 RS5 RS4 RS3 RS2 RS1 RS0

Table C.3: Register for Relay Output

Write Relay Output

Bit # 76543210

BASE +0H RO7 RO6 RO5 RO4 RO3 RO2 RO1 RO0

Note! The default configuration of the digital output channels is a logic 0. This

avoids damaging external devices during system start-up or reset since

the power on status is set to the default value.

Read Isolated Digital Input

Bit # 76543210

BASE +1H IDI7 IDI6 IDI5 IDI4 IDI3 IDI2 IDI1 IDI0

Table C.4: Register for Board ID

Read Board ID

Bit # 76543210

BASE +2H BD3 BD2 BD1 BD0