Clear-Com MS-222 User Manual

INSTALLATION /
Clear-Corn MS-222 2-Channel Main
Station
2.5 INTERCONNECTION SETUP
After determining system configuration and channel assignment, pick a location for the
MS-222; it can be anywhere as long as it is provided with a source of AC power. Check
the Power Block on the rear panel for the proper AC voltage range. See section 2.3 on
the page 12 i it needs changing.
1. Use standard shielded
mic cable (see section 2.2).
ALWAYS AVOID SHARP
BENDS IN THE CABLING; ALLOW AT LEAST 3 inches behind rack-mount
units
for cable extending from rear panels.
2. Route all cables from the Main Station to the Remote Stations. Pin
assignments on
ALL 3-pin intercom connectors
are:
Pin 1 - Common
Pin 2 - +30 Volts DC
Pin 3 - Intercom Audio
3. Route cables away from heavy AC power sources, such as lighting panels,
electric motors,
or power transformers.
4. In permanent installations, BE SURE TO INSTALL THE SYSTEM IN
ACCORDANCE WITH
APPROVED LOCAL
BUILDING CODE.
5. If program
monitoring is required,
connect the external signal
to the Program
Input (3-pin femal) connector on the MS-222 rear panel. The station
operator can hear the program
in the headset mixed
with intercom activity
or
the program
can be sent to
either intercom
line. The program
pre-amp's
gain
is switch-selectable (on the rear panel) for either mic level (-65 dBv nominal
input signal) or line-level (-15 dBv nominal). The input is balanced and the
impedance
is 1 00K Ohms in the line
position, 600 Ohms nominal in
the mic
position.
6. If the Stage.
Announce function is to be
used, connect to the Announce
Output
(3-pin male XLR) connector on the MS-222 rear panel. This output is
transformer balanced, 600 Ohms impedance, and an output level of 0 dBv. If
the output is to be used as an unbalanced source connect one side to
common (pin-2 to pin-1).
If the SA relay is to be used, connect to the appropriate screw lug terminals
(NO or NC) depending on what action is needed for the external equipment
to be controlled. The relay
is a form C, Break before
Make, contact. NOTE: the
contact
rating of the relays are IA resistive at 24 VDC or 1/2A resistive
at 120 VAC.
7. Turn on power switch on the rear panel. The GREEN Power led on the f ront
panel should
illuminate. Plug in a
headset, and set intercom,
Program, and
Sidetone levels as desired.
NOTE ABOUT HEADSETS: The following is a description of a recommended headset.
Mic Type ---- Dynamic Wiring: Pin 1 -- mic common
Impedance -- 150-250 Ohms Pin 2-- mic hot
Output -------- -55dB Pin 3 -- headphone common
Headphone -- Dynamic Pin 4 -- headphone hot
Impedance -- 50-2000 Ohms
11/90 Rev. 1.0 Page 15

Clear-Com MS-222 Specifications

General

Brand	Clear-Com
Model	MS-222
Category	Intercom System
Language	English