Tektronix DAS 9221 Option 04, User Manual

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Reference
DAS System User Manual
3–11
H
Components field. This field only appears if a 92C02 GPIB/Expansion
Module is included in your system. It lets you designate whether you define
signal components within the mainframe (Internal) or whether you define
signal components connected to the 92C02 Module (External). You can
define both internal and external signal components for a given signal event.
If External is selected, additional fields appear in this overlay.
H
Combination field. This field determines the relationship between normal
outputs you have defined for a signal. Selections are OR and AND. This field
only appears if you define two or more output lines for the same signal. Output
and input assignments are shown in the Direction column in this overlay.
H
Modules column. All modules contained in the current cluster are listed here.
The name of the current cluster is shown in the status line at the top of the
menu.
H
Direction column. Entries in this column let you specify whether an output
will be used by the signal being defined, or whether the module will receive
the signal as an input. Selections are Input, Output, and None.
Function key F6: DELETE SIGNAL deletes a signal that is currently displayed.
Cycle through the signal names until the name of the signal you want to delete
appears in the Signal Name field. Then select function key F6: DELETE
SIGNAL. That signal will no longer appear in the list of defined signals. If there
are no signals to delete, this function key will not appear on the menu.
Function key F7: ADD SIGNAL adds a signal. Select function key F7: ADD
SIGNAL; the signal name field will change to fill-in mode. You can type in the
name of a signal event you want to define, or press the Return key and cause a
default name to appear in the field (for example, Signal-1). This function key
does not appear on the menu after you have defined all possible signals.
If you have a 92C02 Module installed in slot 8 of your mainframe (or in the top
slot of an Expansion mainframe), you can use the external event I/O signals by
connecting to a set of square pins. These square pins are accessible through an
opening on the rear panel as shown in Figure 3–6. If you do not plan to use the
external event I/O signals on the 92C02 Module, do not define any external
signals in the Signal Definition overlay.
The external-event in and out signals (pins 2 and 4) shown in Figure 3–6 are
TTL-compatible; the differential BTSYNC signals (pins 5 and 6) are ECL
compatible. When you connect to an external event-in or event-out pin, use pins
1 and 3 as ground references for these signals. The BTSYNC signals are
differential, unterminated, positive-voltage ECL signals (if you use these signals
terminate them through 100
resistors connected to a +3 V sinking supply).
Typical voltage swings for these signals when terminated are approximately
+3.2 V to +4.2 V (ground referenced).
Using the External Event
I/O Pins