Cobalt Digital Inc 9902-2UDX Product Manual page 102

3
Table 3-2 9902-2UDX Function Menu List — continued
User States is a special column which allows a logic state to be set (similar to a register or latch) whenever a defined condition
is first triggered. A user state (which is latched until cleared by some other definable action) can be sucessively used with other
user states, thereby allowing a final action to be invoked only when subordinate user states have been sequentially satisfied as
true.
In the example here, two independent units are used for an EAS alert input (one box supplies alert key video, and the other
supplies automated alert audio). Both communicate their ready signal each using edge-trigger GPO's which are fed to the
respective GPI 1 and GPI 2 on the card. Because these two boxes are independent and cannot be relied upon to provide
coinciding triggers, a chain of user state definers are used here to engage a preset routing key video and EAS audio routing
when both states from both boxes are true in the order of GPI 1 first and then GPI 2 second for this example.
From EAS Keyer Box
From EAS Audio Box
GPI 1
GPI 2
3-64
GPI 1
>
GPI 2
>
Clear User State 1 or 2
Set User State 1
Set User State 2
9902-2UDX PRODUCT MANUAL
9902-2UDX Function Menu List and Descriptions
(continued)
9902-2UDX
Card
GPI 1 (key) cue falling-edge sets user state 1
GPI 2 (audio) cue falling-edge sets user state 2
User state 2 (which requires user state 1 being true
first) sets state 3, which then invokes a preset to load
settings to route EAS key and audio
When either GPI 1 or GPI 2 has a rising-edge trigger
(cease EAS), user states 1 or 2 are cleared, thereby
clearing user state 3. Either state change calls a
preset to revert to normal operation.
9902-2UDX-OM (V1.0)