Opening A Path - Racal Instruments 1256 Manual

1256 User Manual
Using the Front-Panel Controls 3-16
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> Status: Closed

Opening a Path

To open a relay, follow the steps given in the above section,
Closing a Relay, except in step 4 rotate the knob until line 4
(bottom line) of the display reads as shown below:
---PATH CONTROL---
Select Filter Mask
PATH2_____________
<Set to?: Open
Then press the fourth key to open the relay.
Viewing Path States
It is easy to view the states of pathnames on a 1256 system from
the PATH CONTROL menu:
1. Press the top key next to the display. Rotate the knob until
the top line reads:
>---PATH CONTROL---<
2. Select line 3 by pressing the third key:
---PATH CONTROL---
Select Filter Mask
>PATH1_____________<
Status: Open
3. Rotate the knob until line 3 indicates the desired pathname
("PATH2" for this example):
---PATH CONTROL---
Select Filter Mask
>PATH2_____________<
Status: Open
4. Rotate the knob right or left to scan through the pathnames
as desired. Each pathname when displayed will indicate
whether it is open or closed on the fourth line of the display.
Setting Filter Masks
Since a large number of path permutations may exist for a given
selection of cards, it may take time to scroll through all the
possibilities if a large number are defined in the 1256 system. To
minimize scrolling time on the display, filter masks can be easily
set from the front panel to limit the pathnames displayed to only
those that meet user-specified criteria.
Publication No. 980855 Rev. A
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