Joystick override – Grass Valley JEP-100 v.1.2.0 User Manual
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JEP-100 — Installation and Operating Manual
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Operation
Joystick Override
The current version of the JEP uses a 15-pin D female connector on the rear
panel to provide a total of 14 control lines (GPI ports) plus ground. Each
port can be used to trigger a switching event when initi ated by a contact
closure on a customer-provided device.
By default, the contacts connected to Pins 1-14 of the GPI connector are
mapped to Entry numbers 1 through 14 in the CP Input set as signed to the
JEP-100. However, a front-panel menu can be used to manually assign a
port to any router input, or to a sequence (salvo).
Note
GPI assignments always refer to the Entry number in the CP Input Set table.
If the CP Input table is changed such that the Entry number refers to a dif-
ferent Logical Input, the GPI port will now select the new input.
If assigned to a router input, the port can be defined as latching or non-
latching:
•
In latching mode, the JEP-100 will send a switch command for the
source assigned to the triggered control line and not switch away
from that source until a different source (i.e., a different contact) is
selected by the user. For example, if the operator presses and then
releases a joystick push button, the source will remain selected.
•
In non-latching mode, the JEP-100 will send a switch com mand for
the selected source but switch back to the previous source when the
control line returns to a high state (e.g., when the joystick button is
released). This provides a single-button chop or flip-flop style of
operation.
shows an example of the joystick override application, where a
CCU joystick is used to select a camera for QC evaluation. When a camera
is selected (camera 2 in this example) and the joystick button is pressed, the
CCU provides a contact closure on relay 2. The closure is sensed by an opto-
coupler at pin 2 of the JEP-100 GPI con nector, which results in a command
being issued to the CM-4000 to switch input C2 to the output presently
being controlled by the JEP-100.
Wiring between the rear-panel connector and the customer-supplied
contact closure device should be at least 22 AWG (American Wire Gauge)
and no longer than 30 feet (10 meters). A circuit diagram for ports 1-8 is
shown in
(circuitry for ports 8-14 is similar).