Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
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3 Features and Functions<br />
Using the Alarm Output Lines<br />
Four TTL alarm outputs are available on the rear- panel Alarms connector.<br />
You can use these hardware outputs to trigger external alarm lights,<br />
sirens, or send a TTL pulse to your control system. You can assign an<br />
alarm to any configured channel and multiple channels can be assigned to<br />
the same alarm number. Each alarm output line represents the logical<br />
“OR” of all channels assigned to that alarm number (an alarm on any of<br />
the associated channels will pulse the line).<br />
Alarms connector (as viewed from rear of instrument)<br />
You can configure the behavior of the alarm output lines as described<br />
below. The behavior of the alarm annunciators on the front panel also<br />
tracks the alarm output configuration. The configuration that you select <br />
is used for all four alarm output lines. A Factory Reset (*RST command)<br />
clears all four alarm outputs but does not clear the alarm queue in <br />
either configuration.<br />
Latch Mode: In this mode, the corresponding output line is latched true<br />
when the first alarm occurs and remains asserted until you clear it by<br />
initiating a new scan or cycling power. You can manually clear the<br />
output lines at any time (even during a scan) and the alarm data in<br />
memory is not cleared (however, data is cleared when you initiate a<br />
new scan).<br />
Track Mode: In this mode, the corresponding output line is asserted<br />
only when a reading crosses a limit and remains outside the limit.<br />
When a reading returns to within limits, the output line is<br />
automatically cleared. You can manually clear the output lines at any<br />
time (even during a scan) and the alarm data in memory is not cleared<br />
(however, data is cleared when you initiate a new scan). The alarm<br />
outputs are also cleared when you initiate a new scan.<br />
136 <strong>Agilent</strong> <strong>34980A</strong> Mainframe User’s Guide