Harris Legacy 99-1300-0, Operation & Technical Manual

Page: 26 / 98

Revision B • 1/03
H A R R I S C O R P O R A T I O N
2-14
2 Installation
Universal Input Module Logic
and Microphones
The three main functions of microphone logic
are to automatically mute the monitor speakers
in the room with the “hot” mic, to command the
appropriate hot mic warning light, and to acti-
vate such microphone functions as talk to control
room and cough.
The warning commands come from the Control
Room or Studio modules, but it is DS1 (for the A
input) and DS3 (for the B input), switches 2, 3, or
5, on each Universal Input module that tell the
monitor modules whether a mic is located in the
control room, a studio, or an external location.
Pages 2-50 and 2-51 summarize setting up a
Universal Input module as a microphone input,
utilizing a PRE99-1198 Mic Panel (simplified
schematic shown below).
The Mic Panel connects to the module’s LOGIC
I/O connector. To enable the remote control
inputs (On, Off, Cough, Talk to C/R), pin 18 (Acti-
vate Logic Inputs) has to be jumpered to pin 6,
10, 11, or 12 (Logic 5VDC).
The On Tally output drives the LEDs in the On
button and the Off Tally drives the LEDs in the
Off button. The other LEDs (Cough and Talkback)
connect internally to the Logic 5 VDC.
All LEDs are tied to Logic Ground (pins 1, 2 or 3
on the LOGIC I/O connector).
To construct a custom mic control panel like
that shown on this page, use SPST (single pole,
single throw) momentary contact switches with
LED or lamp indicators. Lamps must be 6.3 volt
type with a current draw of under 50 mA.
Tie one side of each switch and lamp to Logic
Common (pin 1, 2 or 3 on the LOGIC I/O connec-
tor). The other side of the Cough and Talkback
lamps tie together to Logic Active Tally (pin 15).
Each switch is tied to its logic counterpart (the
On switch goes to the On (-) input, pin 7, the Off
switch goes to Off (-) input, pin 8, etc.). The on/off
lamps are tied to their Tally outputs (On lamp to
On Tally, pin 17; Off lamp to Off Tally, pin 16).
Tally Common (pin 14) is jumpered to Logic
5VDC (pin 6, 10, 11 or 12) at the LOGIC
I/O connector. Pin 18, Activate Logic Inputs (+)
is also jumpered to Logic 5VDC (typi-
cally pin 6 is used).
Input Module Logic (Universal Input and
Telco ) and Peripheral Devices
Peripheral devices are controlled through the
Start and Stop Command Pulses, or through the
Start Command Sustained logic, and the Com-
mands Common connections.
In the basic logic connection example on pages
2-52 and 2-53, active low logic is used, thus Com-
mand Common is connected to the logic ground
on the peripheral device (labeled Command Com-
mon on the Denon CD player in the example).
In the complex logic example shown on pages
2-54 and 2-55, active high logic is used, thus
Command Common connects to Logic Supply
+5 VDC.
Note: This voltage is more typically supplied
directly by the peripheral device in order to
prevent ground loops.
Mic Control Panel
(Simplified Schematic
for PRE99-1197 or PRE99-1198)
AMBER (TALKBACK)
AMBER (COUGH)
AMBER (OFF)
RED (ON)
TALKBACK
COUGH
ON
OFF
8 J1 TALK TO C/R
7 J1 COUGH
6 J1 ON
5 J1 OFF
S1
S2
S4
S3
GNDD
J1: TO/FROM CONSOLE CHANNEL LOGIC
V+ SUPPLY J1 4
ON TALLY J1 3
OFF TALLY J1 2
LOGIC GND J1 1
CR1 CR2
CR3 CR6
CR4 CR5
CR8 CR7