Selecting the
Interrupt Line
Number
The multiplexer’s IRQ jumper/switch (Figure 1-3) selects one of seven
interrupt lines used to communicate with the system’s Slot 0 module.
In a scanning multimeter configuration (see “Strain Gage Multiplexer
Configurations” on
page 19
), the multiplexer’s (relay and FET) do not use
an interrupt line since communication is between the multimeter and the
Slot 0 module.
In a switchbox configuration, the multiplexers use an interrupt line. At the
factory, the IRQ jumper (or switch) is set to line 1. Since the system
instrument in the Series B mainframe is assigned to each line and the Series
C command module (E1406A) is assigned line 1 by default, it is not
necessary to change the IRQ jumper/switch setting. If the command
module in Series C systems is assigned another line and the switchbox is to
use that line, the IRQ jumper/switch must be set accordingly.
Figure 1-3. The IRQ Jumper/Switch
Chapter 1
Getting Started with the Strain Gage Multiplexers 17
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