Ross LDP-8242, User Manual, Page: 23 / 100

LDP-8242 User Manual (Iss. 03) Introduction • 1–15
Control and Data Input/Output Interfaces
This section briefly summarizes the communication types available for the LDP-8242.
Rear Modules
The LDP-8242 physically interfaces to system video and audio connections using the R2-8242
Rear Module.
All inputs and outputs shown in the video and audio block diagrams ( Figure 1.1 and Figure 1.3
respectively) enter and exit the card via the card-edge backplane connector. The Rear Module
breaks out the LDP-8242 card-edge connections to industry standard connections that interface
with other components and systems in the signal chain.
The rear module cabling is outlined in the section “ Installing a Rear Module ” on page 2-3.
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.
Serial (COMM) Ports
The LDP-8242 is equipped with two, 3-wire serial ports (
COMM 1
-
Serial Port A
,
COMM 2
-
Serial Port B
) which are used for Dolby® metadata Rx and Tx. Each port can independently be
GUI-configured as RS-232 or RS-485.