E1442A Application Examples 43Chapter 2
Chapter 2
E1442A Application Examples
Using This Chapter
This chapter provides application information and examples for using the
E1442A 64-Channel Form C Switch Module in a switchbox. The chapter
contents are:
•General Scanning Information . . . . . . . . . . . . . . . . . . . . . . . . .41
•Saving and Recalling States. . . . . . . . . . . . . . . . . . . . . . . . . . . 44
•Detecting Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
•Scanning with External Instruments . . . . . . . . . . . . . . . . . . . . .46
General Scanning Information
This section lists general scanning information for the E1442A module,
including:
•Switchbox Definition
•How to Scan
•Reset Conditions
•Using Scanning Trigger Sources
•Using the Scan Complete Bit
Switchbox
Definition A switchbox can consist of a single-switch module or multip le-switch
modules. It can also include other switch modules that are controlled by
the same SWITCH device driver. Figure 2-1 shows a typical swit chbox
consisting of three cards (modules).
Figure 2-1. Typical Switchbox Configuration
Command
Module
Note: Physical placement of the Module in the Logical Address
order is not required, but is recommended.
Switch Module
Logical Address = 120
Secondary Address = 15
Card Number 01
Logical Address = 121
Switch Module
Switch Module
Logical Address = 122
128
64
32
16
8
4
2
1
Card Number 02
64
128
16
32
8
4
1
2
Card Number 03
64
128
16
32
8
4
1
2