Connecting User Inputs

The HP E1459A Isolated Digital Input/Interrupt module consists of a component module and a terminal block. User inputs for each channel consists of a low and a high connection for each channel. The inputs will only detect signals of a positive polarity. A logical "1" will only be detected if the high terminal is at a higher potential than the low terminal. It must also meet the drive requirements for the voltage threshold selected.

For each block of 16 channels an additional active low input and two active low outputs are available. The table below lists the signal names and the associated channels.

Port

Channels

External Trigger

Data Available

Interrupt

 

 

 

 

 

0

0 through 15

XTRIG0N

DAV0N

INTR0N

 

 

 

 

 

1

16 through 31

XTRIG1N

DAV1N

INTR1N

 

 

 

 

 

2

32 through 47

XTRIG2N

DAV2N

INTR2N

 

 

 

 

 

3

48 through 63

XTRIG3N

DAV3N

INTR3N

 

 

 

 

 

Figure 1-7shows the front panel terminals and pinouts for the module. The cover to the terminal module is silk-screened to indicate the function of each screw terminal.

22 Installing and Configuring the HP E1459A