Telex Power Supply MS2002 User Manual

User Instructions  
Model MS-2002  
Master Station and Power Supply  
Audiocom® Intercom Systems  
9350-7749-000 Rev B, 10/2003  
 
Contents  
Description .............................................................................................................. 4  
Features ................................................................................................................... 4  
Installation............................................................................................................... 6  
Unpacking ......................................................................................................................................................... 6  
Configuration Pre-check ................................................................................................................................. 6  
Headset Microphone Type Selection DIP Switch .......................................................................................... 8  
Mic Kill Send Enable DIP Switch ................................................................................................................... 8  
Program Interrupt DIP Switches ................................................................................................................... 8  
Incoming Call Beep DIP Switches .................................................................................................................. 8  
Monaural or Binaural Operation DIP Switches ........................................................................................... 8  
Balanced/Unbalanced Switches ...................................................................................................................... 9  
Direct Program Listen Enable / Disable Jumpers ........................................................................................ 9  
Mounting........................................................................................................................................................... 9  
Connections ...................................................................................................................................................... 9  
External Program Input and PA Output ....................................................................................................... 9  
Cables .............................................................................................................................................................. 10  
Power-Up Check ............................................................................................................................................ 16  
Test Tone ......................................................................................................................................................... 16  
Sidetone Adjustment ...................................................................................................................................... 16  
Voice-Activated Microphone (Vox) Setup ................................................................................................... 17  
Operation............................................................................................................... 17  
Public Address (PA) ....................................................................................................................................... 19  
Using Mic Kill................................................................................................................................................. 19  
Using Voice-Activated Microphone (Vox).................................................................................................... 19  
Incoming Call Beep On/Off .......................................................................................................................... 19  
Specifications .................................................................................................................................................. 20  
Quick Reference.................................................................................................... 23  
3
 
Description  
The MS-2002 is a complete 2-channel master station and system power supply (24 V DC, 2 Amps total power) in a  
single unit. You simply plug it into any AC power outlet from 100 to 240 volts, add a microphone or headset, connect  
intercom stations to the back panel, and you’re ready to communicate. It even has both 1-channel and 2-channel  
connectors, so you don’t have to add a separate breakout box if you want to mix 1-channel and 2-channel intercom  
stations. The MS-2002 fits in a standard 19-inch equipment rack and is 1 rack unit high. The basic MS-2002 can  
communicate with two intercom channels. This number can be increased by connecting optional EMS4001Expansion  
Stations. Each EMS4001 adds four additional channels, and up to four of these expansion stations can be connected  
for a total of eighteen channels.  
Features  
1. DYNAMIC-MIC HEADSET CONNECTOR: Accepts headsets with monaural headphones and either a balanced or  
unbalanced dynamic microphone.  
2. PANEL MIC / ELECTRET-MIC HEADSET CONNECTOR: Accepts an electret gooseneck microphone, such as the Telex  
Model MCP-90-XX . The model MCP-90 series panel mic connector is a 1/4” stereo plug, with a threaded  
shaft for easy installation.  
3. VOLUME CONTROL: Adjusts headphone volume only.  
4. VOX TRIMMERS: Used with the voice-activated microphone feature. Separate trimmers adjust the voice  
activation level for the headset and panel microphones.  
5. HEADSET AND PANEL MIC KEYS: Used to manually activate either the headset or panel microphone, whichever  
is being used.  
6. ALL TALK KEY: Used to talk to all stations that are listening on all channels. This includes both MS-2002  
channels and all channels of any connected EMS4001 Expansion Stations.  
7. PA KEY: If the MS-2002 is connected to a public address system, this key may be used to talk over the  
public address system.  
8. MIC KILL KEY: Used to turn off the microphones on any intercom stations on a channel. Also used to  
activate the program inputs and the audible beep feature for incoming calls.  
9. INTERCOM TALK KEYS: Momentary or latching (hands-free) operation possible.  
4
 
10. CALL KEYS: Used to place calls on intercom channels and to indicate incoming calls.  
11. INTERCOM LISTEN KEYS: Momentary or latching operation possible.  
12. SPEAKER VOLUME CONTROL: The Volume control adjusts the level to the front panel speaker. If an external  
speaker is used, volume must be adjusted at the external speaker.  
13. COMBINE / ISOLATE SWITCH:This recessed, pushbutton switch lets you combine the audio signals of the two  
channels to create a single audio channel where all users can intercommunicate. Or, you can isolate each  
channel to create two groups of completely independent users. For normal operation, it should be set in the  
isolate position.  
14. CHANNEL STATUS INDICATORS AND RESET PUSHBUTTON:The indicators are green for normal operation and red  
when there is an overload or short circuit. The Reset pushbutton restores normal operation after the  
short-circuit or overload has been located and fixed.  
15. UNIVERSAL AC POWER INPUT: The MS-2002 accepts any input power in the range of 100-240 VAC, 50/60  
Hz.  
16. 2-CHANNEL INTERCOM CABLE CONNECTORS: One male and one female XLR-6 connector for  
2-channel operation with SS2002, BP2002, etc.  
17. PROGRAM INPUTS CONNECTOR AND TRIMMERS: Each intercom channel has its own program input and level  
adjust trimmer. The program inputs may be turned on or off via the front panel and they may be set to  
interrupt during talk, if desired.  
18. 1- CHANNEL INTERCOM CABLE CONNECTORS: Two connectors are provided for each channel for loop-through  
connection of 1-channel intercom stations, such as the SS1002, BP1002, etc.  
19. PA OUTPUT: Connects to a public address system.  
20. EXPANSION OUT CONNECTOR: Connects to an EMS4001 Expansion Station.  
21. SPEAKER OUTPUT JACKS: May be used with external, powered loudspeakers for monaural or binaural  
listening configurations.  
22. BALANCED / UNBALANCED SELECTOR SWITCHES: The selector switches sets the MS-2002 for compatibility  
with either Audiocom or Clear-Com* channel connector pin-outs, channel power requirements, and call  
signaling requirements. Both switches must be in the same position.  
5
 
Installation  
Unpacking  
The package contains the following items. Contact the shipper or your Audiocom dealer immediately if anything is  
damaged or missing. Detach and fill out the registration card and return it to Telex to properly register your  
MS-2002.  
Qty  
1
Description  
MS-2002 Master Station and Power Station  
Warranty and Registration Card  
User Manual  
1
1
2
Black Face Plates  
WARNING  
The following instructions are for use by qualified personnel only. To avoid electric shock, do not remove the  
cover unless you are qualified to do so.  
AVERTISSEMENT  
Les instructions qui suivent s’adressent uniquement a un technicien qualifie. Pour evite des chocs  
electriques, ne pas ouvrir le boitier, a moins d’y entre habilite.  
Configuration Pre-check  
Before connecting the MS-2002 make sure that it is properly configured for your intended usage. Figure 2 shows  
the locations of the configuration switches. To access internal switches, remove three screws from the top cover and  
three screws from the bottom portion of each side.  
6
 
SW3  
SW1  
Channel 1  
Sidetone  
Channel 2  
Sidetone  
J6  
J3  
R601  
R59  
Figure 2 - Locations of Configuration Jumpers and Switches  
Switch #  
Description  
Settings  
Default  
DIP SWITCH SW1 (INTERNAL)  
On: Unbalanced  
Off: Balanced (Typical)  
SW1-1  
SW1-2  
SW1-3  
SW1-4  
SW1-5  
SW1-6  
SW1-7  
SW1-8  
Headset microphone type  
Call signal send, channel 1  
Off  
On  
On  
On  
On  
Off  
Off  
Off  
On: Enabled  
Off: Disabled  
On: Enabled  
Off: Disabled  
Call signal receive, channel 1  
Call signal send, channel 2  
Call signal receive, channel 2  
Mic kill signal send  
On: Enabled  
Off: Disabled  
On: Enabled  
Off: Disabled  
On: Enabled  
Off: Disabled  
On: Interrupt during talk  
Off: No interrupt  
Program 2 interrupt  
On: Interrupt during talk  
Off: No interrupt  
Program 1 interrupt  
BALANCED (BAL) - UNBALANCED (UNBAL) OPERATION  
BOTH SWITCHES MUST BE SET THE SAME.  
FACTORY DEF AULT IS BALANCED.  
Audiocom or Clear-Com  
operation  
Out: Balanced (Audiocom)  
In: Unbalanced (Clear-Com)  
Rear Panel  
Rear Panel  
Out (BAL)  
Out (BAL)  
Audiocom or Clear-Com  
operation  
Out: Balanced (Audiocom)  
In: Unbalanced (Clear-Com)  
DIP SWITCH SW3 (INTERNAL)  
*SET ALL TO MONAURAL OR ALL TO BINAURAL  
On: Disabled  
Off: Enabled  
SW3-1  
SW3-2*  
SW3-3  
SW3-4  
SW3-5  
SW3-6  
SW3-7  
SW3-8  
Incoming call beep, headset  
Off  
Off  
Off  
Off  
On  
Off  
On  
On  
On: Enabled (Binaural)  
Off: Disabled (Monaural)  
Listen 1 to speaker 1 only  
Incoming call beep, speaker 1  
Incoming call beep, speaker 2  
Listen 2 to right headphone  
Listen 2 to speaker 2  
On: Enabled (SW3-1 must be off)  
Off: Disabled  
On: Enabled (SW3-1 must be off)  
Off: Disabled  
On: Enabled (Monaural)  
Off: Disabled (Binaural)  
On: Enabled (Binaural)  
Off: Disabled (Monaural)  
On: Enabled (Monaural)  
Off: Disabled (Binaural)  
Listen 2 to speaker 1  
On: Enabled (Monaural)  
Off: Disabled (Binaural)  
Listen 1 to left headphone  
Table 1 - Configuration Switch Settings  
7
 
Headset Microphone Type Selection DIP Switch  
SW1-1 applies only to a dynamic-mic headset connected to the dynamic-mic headset jack on the front panel. If the  
headset specifications indicate the microphone type is balanced, or if you are unsure, leave this switch in the off  
(default) position. If the specifications indicate an unbalanced microphone set SW1-1 to on.  
Note: For best results in noisy environments, a noise canceling (directional or cardioid) micro  
phone is highly recommended. This is especially true if you are using the Vox feature.  
Mic Kill Send Enable DIP Switch  
The MS-2002 can generate an inaudible signal which will turn off the microphones on all intercom stations on a  
channel (for stations that detect this signal). This feature is useful, for example, when an unattended microphone has  
been left on and is causing unnecessary noise on a channel. By default, Mic Kill is not enabled. To activate this  
feature set SW1-6 to the on position.  
Program Interrupt DIP Switches  
If you plan on using external program sources with the MS-2002, you have a choice of whether or not you want the  
program audio to shut off on the intercom channel while you are talking. By default, program audio does not  
interrupt during talk. You can change this as follows:  
1. For channel 1 program interrupt during talk, set SW1-7 to on .  
2. For channel 2 program interrupt during talk, set SW1-8 to on .  
Incoming Call Beep DIP Switches  
If call signal receive is enabled (switches SW1-3 and SW1-5), incoming calls will be indicated by red-flashing Call  
keys. An optional beep tone can also be used. Internal switches enable the beep tone. You can then turn the beep  
tone on or off via the front panel during normal operation. Enable the beep tone as follows:  
1. Make sure the call signal receive DIP switches are on (SW1-3 and SW1-5).  
2. For incoming call beep in a headset, set SW3-1 to off.  
3. For incoming call beep in speaker 1, set SW3-1 to off and SW3-3 to on.  
4. For incoming call beep in speaker 2, set SW3-1 to off and SW3-4 to on.  
5. The procedure to turn incoming call beep on or off during operation can be found on page .  
Monaural or Binaural Operation DIP Switches  
The MS-2002 can be used with a single speaker or monaural headphones (single- or double-sided) for monaural  
operation. In this case, all audio signals are combined and sent to the headphones and the front panel speaker. The  
combined signals also go to the Speaker 1 jack on the back panel. The MS-2002 can also be used with two speakers  
for binaural operation. In this case, channel 1 is sent to the Speaker 1 jack and channel 2 is sent to the Speaker 2  
jack. Binaural headphone operation is not supported.  
For monaural operation with headphones or one speaker (factory default):  
1. Set SW3-2 to off.  
2. Set SW3-5 to on.  
3. Set SW3-6 to off.  
4. Set SW3-7 to on.  
5. Set SW3-8 to on.  
8
 
For binaural operation with two speakers:  
1. Set SW3-2 to on.  
2. Set SW3-5 to off.  
3. Set SW3-6 to on.  
4. Set SW3-7 to off.  
5. Set SW3-8 to off.  
Balanced/Unbalanced Switches  
Both of the BAL - UNBAL Switches on the back panel are set at the factory to the balanced (BAL) position for use  
with Audiocom intercom channels. Set the switches to the unbalanced (UNBAL) position for use with a Clear-Com  
intercom systems.  
Direct Program Listen Enable / Disable Jumpers  
By default, each MS-2002 program input can be heard by all intercom stations that are listening on the correspond-  
ing intercom channel. This includes the MS-2002. Program input routing to the intercom channels can be turned on  
or off via the MS-2002 front panel programming. (See “Turning the Program Inputs On and Off”, page .) Addition-  
ally, all program signals can be routed directly to the MS-2002 speaker or headset. This lets the MS-2002 operator  
hear the program inputs even if they are not being routed to the intercom channels. To disable direct program  
listening in the speaker or headset for one or more program inputs, reset the appropriate jumper as shown in Table 2.  
Jumper  
J3  
Description  
Settings for Jumpers  
Program 1 direct to Pins 2&3 Shorted: Enabled  
Headset or Speaker Pins 1&2 Shorted: Disable  
Program 2 direct to Pins 2&3 Shorted: Enabled  
Headset or Speaker Pins 1&2 Shorted: Disable  
J6  
Table 2 - Direct Program Listen Enable / Disable Jumpers  
Mounting  
The MS-2002 mounts in a standard 19 inch equipment rack and is 1 rack unit high. When mounting the MS-2002  
install the supplied black face plates on the appropriate side. The face plates should be mounted with the groves on  
the top.  
Note: You will have to perform the sidetone adjustment (page ) after all components are connected. With  
the MS-2002 being rack mounted, you may not be able to access the sidetone trimmers. In this case, you  
can position the MS-2002 in the rack and make all required connections. Then, adjust the sidetone trim-  
mers before installing and tightening all rack mount screws.  
Connections  
Refer to the following paragraphs, and the sample connection drawings shown in Figures 3 through 7, starting on  
page 10.  
External Program Input and PA Output  
Connections for external program input and PA output are shown in Figure 6, page 13. EMS4001 Expansion Station  
Connection (Optional Component)  
Refer to the EMS4001 User Instruction Manual for detailed connection information.  
9
 
Cables  
The numbers below correspond to the cable numbers in the connection drawings on the following pages.  
1. 1-channel intercom cable. Sold separately. Use Telex “ME” cables, below. Or, build per Figure 7, page 14.  
ME-25: 25' (7.6 m) cable with Male and Female 3-pin XLR connectors.  
ME-50: 50' (15.2 m) cable with Male and Female 3-pin XLR connectors.  
ME-100: 100' (30.4 m) cable with Male and Female 3-pin XLR connectors.  
When connecting from the MS-2002 to a TW-7W, keep cables as short as possible. Also, heavier  
gage wire is recommended.  
2. 2-channel intercom cable. Sold separately. Use Telex “ME /2” cables, below. Or, build per Figure 7, page  
14.  
ME-25/2: 25' (7.6 m) cable with Male and Female 6-pin XLR connectors.  
ME-50/2: 50' (15.2 m) cable with Male and Female 6-pin XLR connectors.  
ME-100/2: 100' (30.4 m) cable with Male and Female 6-pin XLR connectors.  
3. Y adapter cable. Sold separately. Use Telex CA-23-16. Or, build per Figure 7, page 14.  
4. 3 ft (0.91 m) speaker cable with RCA plugs. One supplied with each SPS2001, and SPK-  
2000.  
5. 18" (457 mm) EXP IN/OUT cable, stereo miniplug to stereo miniplug. One supplied with each EMS4001.  
6. 18" (457 mm) CHANNEL OUTPUT cable, 15-pin Male Dsub to 15-pin Male Dsub. One supplied with  
each EMS4001. (Optional component. See EMS4001 User Manual for connection information.)  
7. Shielded patch cable, 9-pin Male Dsub to 9-pin Female Dsub. Customer local purchase: available at Radio  
Shack, etc. Note: All pins must be connected straight through: do not use an RS232 computer cable!  
8. Shielded patch cable, stereo miniplug to stereo miniplug. Customer local purchase. Available at Radio  
Shack, etc.  
9. Shielded audio cable. Must have male 3-pin XLR connector at one end for connection to the XP-USPG or  
XP-4PGM program inputs. Pin-out for program inputs is as follows:  
Pin 1: common  
Pin 2: + program input  
Pin 3: - program input  
10. Shielded audio cable. Must have male 3-pin XLR connector at one end for connection to the XP-USPG PA  
output. Pin-out for PA output is as follows:  
Pin 1: common  
Pin 2: + PA output  
Pin 3: - PA output  
11. 18" (457 mm) CHANNEL OUTPUT cable, 15-pin Male Dsub to 15-pin Female Dsub. One supplied with  
each XP-ES4000A. (Optional component. See EMS4001 User Manual for connection information.)  
10  
 
Figure 3 - MS-2002 Monaural Master Speaker Station Configuration.  
This is a good configuration for smaller intercom systems when you want to operate the MS-2002 as a master speaker station, with  
one speaker to monitor both intercom channels. In this configuration, the Combine/Isolate switch is set to the Isolate position. With  
this setting the 2 intercom channels are completely separated. The MS-2002 dip switches are set to monaural operation so that both  
intercom channels are heard in the speaker.  
11  
 
Figure 4 - MS-2002 Binaural Master Speaker Station Configuration.  
This is a good configuration for smaller intercom systems when you want to operate the MS-2002 as a master speaker station, with  
a separate speaker for each intercom channel. Make sure the MS-2002 internal DIP switches are set for binaural speaker operation  
as described on page 7. Also, set the Combine/Isolate switch to the Isolate position. With this setting the two intercom channesl are  
completely separated. The internal amplified speaker is used as the speaker output for channel 1, and the SPK-2000 is used for  
channel 2.  
12  
 
Figure 5 - MS-2002 typical Speaker Station and Belt Pack Connections.  
Typically, a headset is connected to the front panel of the MS-2002, and the DIP switches are set to the monaural operation (default  
setting) so that both intercom channels as heard in the monaural headphones (binaural headphone operation is not supported). Note  
that belt packs use less power than speaker stations, and you can daisy-chain more of them on a signle cable run. Avoid very long  
cable runs with daisy-chained speaker stations. This example shows how you would “home run” an SS2002 speaker station when  
the cable is very long. Also, set the Combine/Isolate switch to the Isolate position. With this setting the 2 intercom channels are  
completely separated.  
13  
 
Figure 6 - External Audio Input and PA Output.  
You can connect two audio sources to the Program Inputs connector: one for each channel. Audio sources can be directly  
connected with a user-supplied DB9M connector. (Refer to the program input connector specifications, located on page 20, for  
connector pin-out.) However, a more convenient method is to use an XP-USPG Breakout Panel as shown. The XP-USPG also  
interfaces the PA jack of the MS-2002 to a standard , 2-pin XLR audio cable. Note: The XP-USPG Breakout Panel can be rack  
mounted using a BOP-1000 Rack Mount Plate.  
14  
 
TYPICAL 1-CHANNEL CABLE WIRING  
3
2
3
Pair 1  
Pair 2  
2
1 (Both wires)  
1
Shield  
Shield  
Cable Type: 22AWG Stranded, 2-Pair Twisted-wire, with Shield  
Connector Type: 3-Pin XLR Audio (Neutrik or Switchcraft)*  
Pin 1: Common  
Pin 2: Channel Audio / Power  
Denotes twisted pair.  
Pin 3: Channel Audio / Power  
Shield: Earth ground  
Denotes shield.  
TYPICAL 2-CHANNEL CABLE WIRING  
4
3
6
5
4
Pair 1  
Pair 2  
Pair 3  
3
6
5
1 (Both wires)  
Shield  
1
Shield  
Cable Type: 22AWG Stranded, 3-Pair Twisted-wire, with Shield  
Connector Type: 6-Pin XLR Audio (Neutrik only, not compatible with 6-pin Switchcraft)*  
Pin 1: Channel 1 & 2 Common  
Pin 2: No connection  
Denotes twisted pair.  
Denotes shield.  
Pin 3: Channel 1 Audio / Power  
Pin 4: Channel 1 Audio / Power  
Pin 5: Channel 2 Audio / Power  
Pin 6: Channel 2 Audio / Power  
Shield: Earth ground  
3
2
1
“Y” CABLE WIRING  
Ch1  
4
3
6
5
Pair 1  
Pair 2  
Pair 3  
Case  
3
2
1
1 (Both wires)  
Shield  
Ch2  
Shield  
Use second drain wire if available, or add an extra section of wire.  
*
Standard cables are generally constructed using a male connector at one end and a  
female connector at the other end. This allows several cables to be interconnected to  
create longer cable runs. Audiocom master stations, speaker stations and belt packs  
also typically provide both a male and female Neutrik connector for each intercom  
channel. This permits loop-through connection of several intercom stations using the  
standard cables. Audiocom power supplies use a 3-pin male Neutrik connector for  
each channel. Audiocom wallplates use male Neutrik connectors.  
Figure 7 - Audiocom Intercom Cables  
15  
 
Power-Up Check  
Plug in the MS-2002. When power is first applied to the MS-2002, it will perform a power-up reset, in which the  
front panel indicators will cycle through all of their possible colors and then turn off. This verifies the general  
operation of the intercom station and indicators. The MS-2002 also reads the settings of all DIP switches at this time  
and configures itself accordingly.  
Test Tone  
The MS-2002 can generate a test tone, which can be used to verify intercom channel operation after installation or  
to locate a malfunction. This test tone is also used for the sidetone adjustment which follows. Use the test tone as  
follows:  
1. Simultaneously press the All Talk and PA keys to activate the test tone.  
2. Tap the Call key for the channel that you want to test (can be either a MS-2002 channel or an EMS4001  
channel).  
3. Verify that the test tone can be heard at all intercom stations on the channel. Replace any defective cable  
or intercom station where the test tone is being lost.  
4. Tap the same Call key to stop the test signal on that channel.  
5. Press any key except a Call key to turn off the test tone.  
Sidetone Adjustment  
The MS-2002 uses full-duplex audio (the same as a conventional telephone line) in which the talk and listen audio  
are sent and received on the same line. Thus, when you talk on a channel, you will also here your own voice back in  
the speaker or headphones. This is called sidetone. If you are using the MS-2002 with a microphone and speaker,  
sidetone could cause unwanted feedback, since the microphone may pick up your returned voice audio and re-  
amplify it. This could also happen if you are using a headset where the ear cushions do not completely cover the  
ears, although it is probably much less likely. In either of these cases, you should minimize the amount of sidetone.  
On the other hand, if you are using headphones that completely enclose the ears, a certain amount of your own  
voice level is desirable to overcome the muffled sensation when talking. See figure 8, page 16, for the adjustment  
locations.  
If you are using a speaker and microphone, or open-ear style headphones, adjust sidetone as follows:  
1. Simultaneously press the All Talk and PA keys to activate the test tone.  
2. Tap the channel 1 Call key to send the test tone on channel 1.  
3. Increase the volume until you can hear the test tone.  
4. Using a small flat-bladed screwdriver, adjust the channel 1 sidetone through the access hole in the bottom  
of the MS-2002 (Figure ) to minimize the tone volume.  
5. Tap the channel 1 Call key to turn off the test tone on channel 1 when finished.  
6. Tap the channel 2 Call key, and repeat the adjustment for the channel 2 sidetone.  
7. Tap any other key, except a Call key, to turn off the test tone when finished.  
If you are using headphones that completely enclose the ears, adjust sidetone as follows:  
1. Tap the Headset key to turn the headset microphone on.  
2. Tap the channel 1 Talk key to turn it on.  
3. While speaking into the microphone, use a small flat-bladed screwdriver to adjust the channel 1 sidetone  
so that you hear your voice at an acceptable level in the headphones. Tap the channel 1 Talk key to turn it  
off when finished.  
4. Tap the channel 2 Talk key to turn it on, and adjust the channel 2 sidetone as for channel 1. Tap the  
channel 2. Talk key to turn it off when finished.  
16  
 
Figure 8 - MS-2002 Bottom View  
Voice-Activated Microphone (Vox) Setup  
If you are going to use vox, you must adjust the vox level for proper operation. If the vox level is too low, room  
noise will activate the microphone. If the Vox level is too high, the microphone will not activate when you begin  
talking.  
Check and set the level as follows:  
1. If you are using a headset, tap the Headset key twice to turn on headset Vox. Or, if you are using a panel  
microphone, tap the Panel Mic key twice to turn on panel mic Vox. Whichever key you tap, it will glow  
orange when the microphone is off and will flicker or turn green when sound is picked up by the micro  
phone.  
2. Position the microphone at its normal operating location. If you are using a headset, put the headset on and  
position the microphone close to your mouth. Insure that background noise is at the normal operating level.  
3. Do not speak into the microphone.  
4. Check the Headset or Panel Mic key, whichever you are using. If the key is constantly glowing orange, turn  
the Vox trimmer clockwise until the key begins to flicker green (mic activating) then turn the trimmer  
slightly back in the counterclockwise direction until the Panel Mic key just returns to steady orange (mic  
off). If you are wearing a headset, make sure that breathing and movement do not cause the Panel Mic key  
to flicker green. If they do, adjust the Vox control slightly more in the counterclockwise direction to  
eliminate this.  
5. Speak into the microphone in a normal voice, and check that the headset key immediately turns green when  
you talk. If it does not, move the microphone closer to your mouth. If you are still unable to get satisfactory  
results, it may be that the microphone does not have the directional characteristics required for the noise  
level in the room. A directional, or cardioid, microphone is recommended when using Vox. Omnidirectional  
microphones mode, the Mic Kill key will be unlit, and in programming mode it will be lit continuously. To  
return the MS-2002 to normal operation if it has been left in programming mode, tap the Mic Kill key.  
Operation  
Note: A quick-reference to the following operating features can be found on the inside of the back cover.  
NORMAL VS PROGRAMMING MODE  
The MS-2002 has two operating modes: normal operating mode and programming mode. In normal operating  
mode, the Mic Kill key will be unlit, and in programming mode it will be lit continuously. To return the MS-2002 to  
normal operation if it has been left in programming mode, tap the Mic Kill key.  
17  
 
VOLUME ADJUSTMENT  
If you are using a headset, adjust the intercom listen level with the left Volume control on the front panel of the  
MS-2002. If you are using a speaker, adjust the intercom listen level with the right Volume control next to the  
speaker. External speakers will require their own volume controls  
RECEIVING CALLS  
1. When there is an incoming call signal on a channel, the Call key for that channel will flash red. There will  
also be a beep tone if the beep feature has been activated (page 7).  
2. Activate the microphone: If you are using a dynamic-mic headset tap the Headset key to turn the mic on; if  
you are using a panel-mounted microphone or an electret-mic headset, tap the Panel Mic key to turn the  
mic on.  
Note: You can also use the voice-activated microphone (Vox) feature. See page 16.  
3. Turn on the Talk and Listen keys for the calling channel and begin your conversation. Turn the keys off  
when finished.  
Note: When you tap the Headset key, or the Panel Mic key, or any Talk or Listen key, it will lock in the on  
position. You may then tap the key again to turn it off. For momentary activation, press and hold the key. It will  
remain on as long as you hold it and it will turn off when you release it.  
CALLING AN INTERCOM CHANNEL  
1. Press and hold the Call key for the channel that you want to call. An inaudible call signal will be sent, and  
your listen key for that channel will automatically turn on in preparation to receive a verbal response.  
2. When you hear a response, release the Call key.  
3. If you are using manual microphone activation instead of Vox, make sure your microphone is on: for a  
dynamic mic headset, tap the Headset key to turn it on; for a panel-mounted microphone or electret  
headset, tap the Panel Mic key to turn it on.  
4. Turn on the Talk key for the channel you called to begin you conversation.  
5. Turn off your Talk and Listen keys to end the conversation.  
MICROPHONE MUTE DURING TALK  
You can mute the microphone while talking. Simply tap either the Headset key or the Panel Mic key, whichever is  
currently being used. Tap the key again to turn the microphone back on. (If you are using Vox, tap the key twice to  
reactivate vox.)  
ALL TALK  
You can talk to all intercom stations that currently have their listens activated. This applies to both channels of the  
MS-2002 as well as all talk channels of any connected EMS4001 Expansion Stations. Use All Talk as follows:  
1. If you are using manual microphone activation instead of Vox, make sure the proper microphone switch  
is turned on (either Headset or Panel Mic).  
2. Press and hold the All Talk key while talking. Release it when finished.  
Note: To insure that the All Talk key is never accidentally left in the on position, it does not latch.  
18  
 
Public Address (PA)  
If the PA output on the back panel of the MS-2002 is connected to a public address system, you can talk on the  
public address system as follows:  
1. If you are using manual microphone activation instead of Vox, make sure the proper microphone switch  
is turned on (either Headset or Panel Mic).  
2. Press and hold the PA key while talking. Release it when finished.  
Note: To insure that the PA key is never accidentally left in the on position, it does not have latching opera-  
tion.  
Turning the Program Inputs On and Off  
1. Insure that program inputs have been connected at the back panel and that the program sources are on.  
2. Press and hold the Mic Kill key for about 2 seconds, then release it. It should now be glowing green to  
indicate that the MS-2002 is in programming mode.  
3. The current status of the program inputs is indicated by the Talk keys. If the channel 1 Talk key is lit, the  
program 1 input is currently activated to channel 1; if channel 2 talk is lit, program 2 is activated to  
channel 2. Tap either Talk key to turn the program input for that channel on or off.  
4. When the program inputs are configured as desired, tap the Mic Kill key to exit programming mode and  
return to normal operation.  
5. Adjust program 1 and 2 levels via the trimmers on the back panel of the MS-2002.  
Using Mic Kill  
If the Mic Kill feature has been enabled you can use it to deactivate all talk keys on a single channel or on all  
channels. This feature is useful when a remote talk key has been left on and is causing unwanted noise on a channel.  
Use Mic Kill as follows:  
1. Tap the Mic Kill key. It will blink green.  
2. Tap the Talk or Listen key for a channel to turn off all talk keys on that channel. Or, tap the All Talk key  
to turn off all talk keys. The key you tap will turn green and the Mic Kill signal will be sent.  
3. Tap Mic Kill to exit.  
Using Voice-Activated Microphone (Vox)  
If you use Vox you will not have to insure that the microphone key is turned on whenever you want to talk. Activate  
Vox as follows:  
1. Make sure the Headset and Panel Mic keys are off.  
2. If you are using a headset, tap the Headset key twice to turn on headset vox. Or, if you are using a panel  
microphone, tap the Panel Mic key twice to turn on panel mic vox. Whichever key you tap, it will glow  
orange when the microphone is off and will flicker or turn green when the microphone turns on.  
Note: The Vox level may require adjustment, see “Voice-Activated Microphone (Vox) Setup”, page 16.  
Incoming Call Beep On/Off  
Normally, incoming calls are indicated by red-flashing Call keys. An optional beep tone can also be enabled as  
follows:  
1. Ensure that this feature has been activated via internal switches (page 7).  
2. Press and hold the Mic Kill key for about 2 seconds, then release it. It should now be glowing green to  
indicate that the intercom station is in programming mode.  
3. Tap either Call key on the MS-2002 to turn the beep feature on or off. (It doesn’t matter which one you  
tap, since this feature affects both channels.)  
4. Tap the Mic Kill key to return to normal operation.  
19  
 
Specifications  
General  
Power Requirements:  
AC Input: 100-240 VAC, 50/60 Hz  
Channel Power: 24 VDC nominal (12 to 30 VDC), 65 to 150 mA  
MS2002 is capable of supplying 2 amps overall  
Dimensions: 1.75" (44.5 mm) high x 19" (483 mm) wide x 10.31" (261.9 mm) deep  
Weight: approximately 4.5lb (2 kg)  
Environmental Requirements:  
Storage: -20°C to 80°C; 0% to 95% humidity, non-condensing  
Operating: -15°C to 60°C; 0% to 95% humidity, non-condensing  
Dynamic-mic Headset  
Microphone: 50 to 200 ohm, dynamic (balanced or unbalanced)  
Headphones: 150 to 600 ohm, monaural  
Connector Type: XLR-4M  
Pin 1 Microphone low  
Pin 2 Microphone high  
Pin 3 Headphone high  
Pin 4 Headphone low  
Panel Microphone Input  
Microphone Type: Electret condenser  
Power: Phantom (+5 VDC)  
Nominal Level: -42 dBu  
Maximum Level: -25 dBu  
Connector Type: IKP12 (MCP-90 series, stereo plug connector)  
Program Input  
Input Level: 100mV maximum  
Voltage Gain: 25 ±3 dB  
Output Level (to intercom channel) :1.0 Vrms nominal, 2.3 Vrms max.  
Input Impedance: 75 kohm  
Common Mode Rejection: Greater than 50 dB  
Connector Type: 9-pin female D-sub (DE9S)  
Pin 1 Ground  
Pin 2 Program 1 input low  
Pin 3 Program 2 input low  
Pin 4 NC  
Pin 5 NC  
Pin 6 Program 1 input high  
Pin 7 Program 2 input high  
Pin 8 NC  
Pin 9 NC  
20  
 
Intercom Channels, Balanced Mode (Both Back Panel and internal switches (BAL/  
UNBAL) must be set to same setting)  
Output Level: 1 Vrms nominal  
Input Impedance: 300 ohms  
Bridging Impedance: greater than 10,000 ohms  
Sidetone: -40 dB, 35 dB adjustable range  
Call Signaling:  
Send: 20 kHz ±100 Hz, 0.5 Vrms ±10%  
eceive: 20 kHz ±800 Hz, 100 mVrms  
Mic-Kill Frequency:  
Send: 24 kHz ±300 Hz, 0.5 Vrms ±10%  
Detect: 24 kHz ±800 Hz, 100 mVrms  
Noise Contribution: less than -70 dB  
Common Mode Rejection Ratio: greater than 50 dB  
Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel (permits  
“loop-thru” connection). Two XLR-6M (Neutrik) connectors for 2-channel connection.  
XLR-3 Balanced Configuration Pinouts  
Pin 1: Common  
Pin 2: Intercom audio low and +24 VDC input  
Pin 3: Intercom audio high and +24 VDC input  
XLR-6 Balanced Configuration Pinouts  
Pin 1: Audio and DC Common  
Pin 2: Local power (12 to 15 VDC, 65 to 150 mA)  
Pin 3: Intercom channel 1 audio low and +24 VDC phantom power  
Pin 4: Intercom channel 1 audio high and +24 VDC phantom power  
Pin 5: Intercom channel 2 audio low and +24 VDC phantom power  
Pin 6: Intercom channel 2 audio high and +24 VDC phantom power  
Intercom Channel, Unbalanced Mode (Both Back Panel and internal switches (BAL/  
UNBAL) have to be set to same setting)  
Output Level: 1 Vrms ±10%  
Input Impedance: 150 ohms  
Bridging Impedance: greater than 10,000 ohms  
Call Signaling:  
Send: 11 ±3 VDC  
Receive: 4 VDC minimum  
Connector Type: Uses same connectors as for balanced mode, above, but with pinouts  
modified by BAL/UNBAL switch on back panel as follows:  
21  
 
XLR-3 Unbalanced Configuration Pinouts  
Pin 1: Common  
Pin 2: +24 VDC input  
Pin 3: Intercom audio high  
XLR-6 Unbalanced Configuration Pinouts  
Pin 1: Common  
Pin 2: Local power (12 to 15 VDC, 65 to 150 mA)  
Pin 3: Channel 1 +24 VDC input  
Pin 4: Channel 1 Intercom audio high and DC call  
Pin 5: Channel 2 +24 VDC input  
Pin 6: Channel 2 Intercom audio high and DC call  
PA Output  
Output Level: 235 mVrms nominal  
Connector Type: 1/8-inch Stereo Phone Jack  
Tip: PA output high  
Ring: Not used  
Sleeve: Common  
Speaker Output  
Output Level: 0 dB nominal (1.0 Vrms)  
Output Impedance: 1000 ohms nominal  
Frequency Response: 200 Hz to 8 kHz +1/-3dB  
Connector Type: RCA Phono Jack  
Tip: Speaker output high  
Sleeve: Common  
Expansion Input /Output  
Type: 2.0 mm stereo phone jack  
Tip: Talk output  
Ring: Listen input  
Sleeve: Common  
Headphone Amplifier  
Voltage Gain: 30 ±3 dB  
Maximum Output: 250 mW ±10% into 150 ohms, 65 mW±10% into 600 ohms  
Frequency Response: 200 Hz to 8 kHz +1/-3db  
Incoming Call Beep Tone: 2 kHz, at the headphones  
Total Harmonic Distortion: Less than 0.2% at 200 mW  
Sidetone: 18 ±2 dB, adjustable  
22  
 
                                          
E
DDEESCRIPTION  
                                                                                        
                                                                                                                                  
Quick Reference  
AACCTION  
Reset MS-2002  
Reset EMS4001  
Test signal on  
Test signal off  
Mic latched on  
Mic latched off  
Mic momentary on  
Mic momentary off  
VOX mode on  
VOX mode off  
All talk on  
Press All Talk and Listen 1  
Press All Talk and Listen 5  
Press All Talk and PA, then tap Call  
Tap Call, then tap any other key  
Tap Headset or Panel Mic (key is green)  
Tap Headset or Panel Mic  
Hold Headset or Panel Mic  
Release Headset or Panel Mic  
Tap twice: Headset or Panel Mic (key is orange)  
Tap Headset or Panel Mic  
Hold All Talk when Headset or Panel Mic is lit (All Talk key  
is green)  
All talk off  
Release All Talk  
Public Address  
Hold PA when Headset or Panel Mic is lit (PA key is green)  
Mic kill, one channel  
Tap Mic Kill, then tap Talk or Listen (Mic Kill key will blink  
green and the Talk and Listen keys are green). Tap Mic Kill  
to exit  
Mic kill, all channels  
Program on  
Tap Mic Kill, then tap All Talk (Mic Kill key will blink green  
and all Talk and Listen keys are green). Tap Mic Kill to exit  
Hold Mic Kill, then tap channel's Talk key (key is green). Tap  
Mic Kill to exit  
Program off  
Hold Mic Kill, then tap the channel's Talk key. Tap Mic Kill  
to exit  
Audible call alert on  
Audible call alert off  
Hold Mic Kill, then tap either Call (all Call keys are red).  
Tap Mic Kill to exit  
Hold Mic Kill, then tap either Call. Tap Mic Kill to exit  
Turn mic kill key off  
Talk latched on  
Tap Mic Kill  
Tap Talk (key is green)  
Tap Talk  
Talk latched off  
Talk momentary on  
Talk momentary off  
Call signal on  
Hold Talk  
Release Talk  
Hold Call  
Call signal off  
Release Call  
Receive call signal  
Listen latched on  
Listen latched off  
Listen momentary on  
(Call key blinks red)  
Tap Listen (key is green)  
Tap Listen  
Hold Listen  
23  
 
 

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