
2 Installation
digital
Revision C • 1/04
H
A
R
R
I
S
C
O
R
P
O
R
A T
I
O
N
2-37
FUNCTIONAL DESCRIPTION OF CONNECTION
A pair of Normally Open (N/O) relay contacts. The two contacts maintain a “contact closure” while a Control
Room mic module (with DS1-2 or DS3-2 set to ON) is turned on. The two pins can be used as a “dry contact”
output, or one can be connected to the Warning Lamp control input while the other is tied to ground (to
generate an active low logic output) or to + logic voltage (to generate an active high logic output).
This Normally Open (N/O) contact connects to Tallies Common while the control room speakers are muted.
This Normally Open (N/O) contact connects to Tallies Common while the control room speakers are
dimmed.
This Normally Open (N/O) contact connects to Tallies Common while Talkback is received by the Control
Room.
This pin must be tied high or low to provide the return path for the various Tally outputs. Typically, the tally
lamps (or external relays) are all tied to ground and Tallies Common is the source for the lamp / relay supply
voltage (+5 to +60 VDC). If the Tallies / relays are tied to +VDC, then this pin ties to ground.
To enable the control inputs: Mute and Dim, tie this pin to + logic voltage (+5 to +40). When tied to an
isolated device like a remote panel, use the Logic 5 VDC (jumper pin 14 to pin 6 or 7).
When pulled low, mutes the Control Room monitors.
When pulled low, dims the Control Room monitors by 12 dB.
Module logic voltage output sources that can deliver up to 300 mA of current to isolated control panels.
The pins are simply paralleled for convenience.
Module logic ground. Should be connected to isolated control panels only.
PIN NAME/NUMBER
WARNING RELAY
(pins 4 and 5)
MUTE TALLY (pin 11)
DIM TALLY (pin 12)
TALKBACK TALLY (pin 13)
TALLIES COMMON (pin 10)
ACTIVATE LOGIC INPUTS (+)
(pin 14)
MUTE (-) (pin 8)
DIM (-) (pin 9)
LOGIC 5 VDC
(pins 6 and 7)
LOGIC GROUND
(pins 1, 2, 3)
Control Room Module, LOGIC, Logic Signal Definitions