IN1804 Seamless Scaling Switchers • Installation 19
NOTE: When using shielded twisted pair cable in bundles or conduits, consider the
following:
• Do not exceed 40% fill capacity in conduits.
• Do not comb the cable for the first 20 meters, where cables are straightened,
aligned, and secured in tight bundles.
• Loosely place cables and limit the use of tie wraps or hook-and-loop fasteners.
• Separate twisted pair cables from AC power cables.
Wiring the Contact/Tally Connectors
The CONTACT/TALLY portion of the rear panel on all models contains seven sets of contact
and tally captive screw connectors (numbered 1 through 7), each with two pins labeled
C and T, for contact closure and tally indicator devices. The CONTACT/TALLY panel also
contains a 2-pole captive screw connector with a G (ground) pin and a +V pin that provides
+5 VDC power to the indicator devices connected to the tally (T) ports.
These ports can be used for triggering and feedback associated with the selected input,
for contact-based input switching, and for other triggered functions such as CEC display
control or video mute. Contact/Tally ports are typically used with Extron Show Me (SM)
cables or with external equipment (such as the Extron CCB 30) to control IN1804 functions,
depending on which Contact/Tally port is used.
1
CT
2
CT
3
CT
4
CT
5
CT
6
CT
7
CT GV+
CONTACT
/TALLY
Figure 14. Contact/Tally Panel
• Contact/Tally ports 1 through 4 — (See figure 14,
1
) Each CONTACT/TALLY
connector is labeled with the number of the video input associated with it. Wire a
push button or other contact closure switch to pin C (Contact) and to the shared pin G
(ground,
3
).
• If using a tally indicator, connect the indicator device to the shared +V pin (5 VDC,
required for tally devices without a power supply,
4
) and the T (Tally) pin.
In other words, the V+ pin of the switcher connects to the voltage in (anode) of
the indicator, and the T pin connects to the tally output (cathode) of the indicator
device.
NOTE: If the indicator has an internal power supply, it is not necessary to
connect it to the V+ pin. It can be connected directly to the T pin of the
Contact/Tally input connector.
• If using an SM cable, see Connecting Using an SM Cable on the next page.
• Ports 5 through 7 (configurable via PCS) — (
2
) Wire a push button or other
contact closure switch to pin C and to the shared pin G. If using a tally indicator, connect
the indicator device to the shared +V pin and the T pin.
See the IN1804 Series Help File for instructions on configuring these ports using PCS.
14
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