Clear-Com RCS-2700 - Manual (Page 32)

R C S - 2 7 0 0 S O U R C E A S S I G N M E N T P A N E L 2 - 1 2
WIRING THE PRESET-SELECT CONTACT CLOSURE (6)
The contact closure on the rear panel labeled “Preset-Select Contact” allows you
to wire button or relay contacts to select presets. To use this feature, connect
normally open button or relay contacts, or a +5 VDC (active low) logic output,
to these contacts. For logic connections, note the ground and signal connections
shown in Figure 2-13.
Figure 2-13: Ground and Signal Connections for a Logic-Output Device
To select a preset with a contact closure:
1. Close the contact the number of times that equals the desired preset number.
Close the contact once for preset 1, twice for preset 2, and so on.
2. Hold each connection for at least three seconds.
3. Release the contacts.
The RCS-2700 will change to the selected preset.
If the sequence of contact closures stops with an open condition for two seconds,
the change is cancelled. Each time a new sequence of contact closures is initiated,
the counting begins from “1.” Selecting a preset with a contact closure in this
way allows you to know which preset you have selected without visual indicators.
The timing of the contact closure is as follows:
• Counting contact closure: .25 to 1 second
• Release time between counting contact closures: .25 to 1 second
• Contact closure time required to enable preset change: 3 seconds or more
Note that all Clear-Com PL main stations and some remote stations have a
contact closure triggered by the stage announce button. If the stage announce
button is not being used for other purposes, it can serve as a preset-select
connection for the RCS-2700.
You can select a preset with a preset-select contact even when a PC or RCU-67 is
connected to the RCS-2700 unit at the same time. You can also select a preset
when the RCS-2700 unit’s front-panel preset button is locked.
SETTING TERMINATION SWITCHES (7)
Each Clear-Com party-line channel requires one and only one termination. The
RCS-2700 provides switchable terminations at the source connections.
Therefore, terminations for party-line channels coming from main stations or
power supplies should be turned off at those sources to allow the RCS-2700 to
provide the terminations. There will be less crosstalk and noise on the intercom
DATA
LINKS
PRESET
SELECT
CONTACT
Ground
Signal
• You can use button or
relay contacts to select
presets.