500 Series plug-in interface: Difference between revisions

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In early 500-series systems (e.g., a [[C|Type C plug-in]] in a [[535|535 mainframe]]),
In early 500-series systems (e.g., a [[C|Type C plug-in]] in a [[535|535 mainframe]]),
the mainframe's triggering is based on the main vertical signal
the mainframe's triggering is based on the main vertical signal (pins 1/3).
sent by the plug-in to the mainframe on pins 1 and 3.


In these scopes,changing the vertical position control on the plug-in
In these scopes, changing the vertical position control on the plug-in
interacts with the trigger level setting if the scope is set to a DC trigger mode.
interacts with the trigger level setting if the scope is set to a DC trigger mode.


In somewhat later 500-series systems, the plug-in (e.g., [[1A1|Type 1A1]])
In somewhat later 500-series systems (e.g. [[547|Type 547]]), the plug-in (e.g. [[1A1|Type 1A1]])
provides the mainframe (e.g., [[547|Type 547]]) with a trigger signal on pin 5, separate from the main vertical signal.
provides the mainframe with a separate trigger signal on pin 5 whose DC level is not affected by
the vertical position knob.  In multi-trace setups, this allows consistent triggering from a specific
input channel independent of which channel is currently being drawn on CRT.


The vertical position knob on the plug-in doesn't affect the DC level on the trigger signal sent from the plug-in to the mainframe.
For backward compatibility, the 547-era scopes have two types of INT triggering, taking the trigger  
This allows, in multi-trace setups, for the operator to consistently trigger from a specific input channel independent
signal either from the main vertical plug-in output (1/3), or the trigger output (5).
of which channel is currently being drawn on CRT.


Although the Type 1A1 has two input channels, they are not identical.
Although the Type 1A1 has two input channels, they are not identical - the pin 5 internal trigger
Only the channel 1 signal is sent to the mainframe on pin 5.
signal is always taken from channel 1. Even later 500-series plug-ins (e.g., the [[1A4|Type 1A4]]),
 
have a knob for the selection of which input channel's signal supplies the trigger signal.
The 547 has two types of INT triggering, differing in whether the mainframe's trigger circuit is fed by the
pin 1,3 (main vertical) output of the plug-in or the pin 5 (trigger signal) output.
 
In even later 500-series plug-ins (e.g., the [[1A4|Type 1A4]]),
the plug-in has a knob for the selection of which input channel's signal
will be sent to the mainframe as the trigger signal.
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