Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005

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3 Features and Functions Using the Alarm Output Lines Four TTL alarm outputs are available on the rear- panel Alarms connector. You can use these hardware outputs to trigger external alarm lights, sirens, or send a TTL pulse to your control system. You can assign an alarm to any configured channel and multiple channels can be assigned to the same alarm number. Each alarm output line represents the logical “OR” of all channels assigned to that alarm number (an alarm on any of the associated channels will pulse the line). Alarms connector (as viewed from rear of instrument) You can configure the behavior of the alarm output lines as described below. The behavior of the alarm annunciators on the front panel also tracks the alarm output configuration. The configuration that you select is used for all four alarm output lines. A Factory Reset (*RST command) clears all four alarm outputs but does not clear the alarm queue in either configuration. Latch Mode: In this mode, the corresponding output line is latched true when the first alarm occurs and remains asserted until you clear it by initiating a new scan or cycling power. You can manually clear the output lines at any time (even during a scan) and the alarm data in memory is not cleared (however, data is cleared when you initiate a new scan). Track Mode: In this mode, the corresponding output line is asserted only when a reading crosses a limit and remains outside the limit. When a reading returns to within limits, the output line is automatically cleared. You can manually clear the output lines at any time (even during a scan) and the alarm data in memory is not cleared (however, data is cleared when you initiate a new scan). The alarm outputs are also cleared when you initiate a new scan. 136 Agilent 34980A Mainframe User’s Guide
Features and Functions 3 You can control the slope of the pulse from the alarm outputs (the selected configuration is used for all four outputs). In the falling edge mode, 0V (TTL low) indicates an alarm. In the rising edge mode, +5V (TTL high) indicates an alarm. A Factory Reset (*RST command) will reset the slope to falling edge. Note: Changing the slope of the output lines may cause the lines to change state. Front Panel Operation: To manually clear all four alarm output lines, select: Alarm > CLEAR ALARM OUT? > YES|NO To select the output configuration for all four output lines, select: Alarm > ALARM OUT SIGNAL > TRACK|LATCH To configure the slope of all four output lines, select: Alarm > ALARM OUT SLOPE > NEGATIVE|POSITIVE Remote Interface Operation: To clear the specified output lines (or to clear all four lines), use one of the following commands. OUTPUT:ALARM2:CLEAR OUTPUT:ALARM:CLEAR:ALL To select the output configuration for all four output lines, use the following command. OUTPut:ALARm:MODE {LATCh|TRACk} Clear alarm output line 2 Clear all four alarm outputs To configure the slope of all four output lines, use the following command. OUTPut:ALARm:SLOPe {NEGative|POSitive} Agilent 34980A Mainframe User’s Guide 137
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Agilent 34980A  Multifunction Switch/Measure Unit *34980-90005*

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Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005