9921-FS-OM (V1.18)
9921-FS PRODUCT MANUAL
1-21
Introduction
9921-FS Functional Description
Control and Data Input/Output Interfaces
GPI Interface
Two independent ground-closure sensing GPI inputs (
GPI 1
and
GPI 2
; each
sharing common ground connection as chassis potential) are available.
Associated with each GPI user control is a selection of one of 64 user-defined
card presets in which GPI activation invokes a card control preset. Because
the GPI closure invokes a user-defined preset, the resulting setup is highly
flexible and totally user-defined. Invoking a user preset to effect a change
involves card setup communication limited only to the items being changed;
the card remains on-line during the setup, and the called preset is rapidly
applied.
GPI triggering can be user selected to consider the activity on discrete GPI
ports, or combinations of logic states considering both GPI inputs. This
flexibility allows multistage, progressive actions to be invoked if desired.
Indication is provided showing whenever a GPI input has been invoked.
GPO Interface
Two independent SPST NO electromechanical non-referenced (floating)
contact pairs (
GPO 1/1
and
GPO 2/2
) are available. A GPO can be invoked by
setting a GPO to be enabled when a card preset is in turn applied (i.e., when a
preset is invoked (either manually or via event-based loading), the GPO is
correspondingly also activated.
Serial (COMM) Ports
The 9921-FS is equipped with two, 3-wire serial ports (
COM 1 - Serial Port 1
,
COM 2 - Serial Port 2
). The ports allow serial metadata import and export
between optional Dolby
®
encoders and decoders. The ports also provide for
SMPTE 2020 de-embedding to an output port, and provide RS-485 LTC I/O
(when licensed with LTC).
