Grass Valley JEP Series v.1.3.0 - Manual (Page 73)

JEP Series — Installation Manual 73
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 initiated 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 assigned 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 command 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.
The example in Figure 37 on page 74 shows the joystick override applica-
tion, 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 optocoupler at pin 2 of the JEP-100 GPI connector,
which results in a command being issued to the CM-4000 or CM-4400 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 Figure 22 (circuitry for ports 8-14 is similar).