Crystal Vision
Installation
TANDEM-110 User Manual R1.8
77
07/07/2010
5.3 Using GPI outputs
GPO 5 and GPO 6 can be assigned from Statesman and/or the card-edge controls to signal
an error condition when loss of video, audio or AES reference occurs.
GPO 5 and GPO 6 may be assigned to signal paths as follows:
GPO 5 assignment
GPO 6 assignment
SDI 1 / De-embedder A / Embedder C
SDI 2 / De-embedder B / Embedder D
A GPO will be asserted low if any of the following conditions arise:
loss of SDI input
loss of selected embedded audio group input if de-embedder enabled
loss of AES 1 input to DIP2 or DIP2-RS card
loss of AES 2 input to DIP2 or DIP2-RS card if that error condition in enabled
by Statesman, or set to 'flag' by card-edge control - ignored if box not ticked, or
set to 'mask', respectively.
loss of AES reference input to DOP2-75 or DOP2-110 if that error condition in
enabled by Statesman, or set to 'flag' by card-edge control - ignored if box not
ticked, or set to 'mask', respectively
loss of 'active audio content' if that error condition in enabled by Statesman, or
set to 'flag' by card-edge control - ignored if box not ticked, or set to 'mask',
respectively
Loss of active audio content or silence occurs when audio peaks are sustained at below 30
VU / -50 dBFS for a period longer than the Silence Detect Delay.
Note:
Values for Silence Detect Delay for both sides start at 1.5s and then in increments of 8s
from 8s to 120s
GPI Presets
With GPI control enabled, remote switches can be used to recall any of the 16 stored
preset configurations. The GPI lines are normally pulled up on-board to +5V via 2k2 ohm
resistor and can be used with closed-contact switches or +5V to +24V logic levels.
Each slot has an associated set of GPI connections for remote control and external status
outputs on the frame rear-panel remote connectors. For convenience, GPI lines are
associated with reference codes ‘a’ to ‘f’ in the connector pin-out tables for each frame.
The following table shows how the four GPI lines 'a' to 'd' are used as a four-bit binary
code to select up to sixteen TANDEM-110 presets.
