SW HD 4K PLUS Series • Installation 10
Wiring the CONTACT/TALLY Connectors
To enable input switching via contact closure, connect a push-button contact closure device
to a Contact connector (see figures 2 and 3,
G
, on page 5).
To identify the currently selected input when the front panel buttons are not visible, connect
a device such as an LED to the CONTACT/TALLY connector (
G
) and to the +V connector
(
D
). When the input you are using is selected, the corresponding Tally Out pin shorts to
ground, activating the connected indicator.
SW2 and SW4 CONTACT/TALLY Connectors
The CONTACT/TALLY panel on the SW2 and SW4 models contains one (SW2) or two (SW4)
female captive screw connectors, each with two pairs of pins labeled C and T.
1
1
CTCT
34
CTCT+V
12
Tx Rx G
RS‑232
REMOTECONTACT / TALLY
Figure 7. Contact/Tally and Remote RS‑232 Ports on SW2 and SW4 Models
Each pin pair is labeled with the number of the HDMI input associated with it. (For example,
in figure 7,
1
, the number 1 indicates the contact and tally pins for input 1.) Wire devices to
these connectors as follows:
1. SW2 — Wire and connect the provided 5-pole plug to the 5-pole CONTACT/TALLY
captive screw connector on the rear panel.
SW4 — Wire and connect the provided 5-pole plug to the CONTACT/TALLY
connector on the left (containing pin pairs 1 and 2), and wire and connect the provided
4-pole plug to the connector on the right (pin pairs 3 and 4).
2. Connect contact input and tally output devices to the pin pair for each input:
• To enable input switching via contact closure, connect a push-button contact
closure input device to pin C (
2
) and to the G (ground) pin (
5
) of the 3-pole
RS-232 connector.
• To identify the currently selected input when the front panel buttons are not visible,
connect an indicator device, such as an LED, to tally output pin T of the same pair
of pins (
3
).
When the input you are using is selected, the corresponding tally out pin shorts to
ground, which activates the connected indicator.
3. Insert the power wires for the contact indicator devices into the +V connector (
4
).
4. Press the button on the contact closure device to switch the connected input to the
output.
7
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