Telex Intercom System WM1000 User Manual

®
Telex  
User Instructions  
WM2000  
TM  
GRN 1  
RED 2  
Ch Select  
Listen  
Call  
T
alk  
ume  
Headset  
WM2000 Shown  
Model WM1000 / WM2000  
Wall Mount Intercom Stations  
Audiocom® Intercom Systems  
®
 
Audiocom®  
Description  
The WM1000 and WM2000 Intercom Stations are designed for stationary, wall-  
mounted installation in standard two-gang electrical boxes. The WM1000 is a  
single-channel station; the WM2000 provides switch-selectable access to either of  
two intercom channels. The WM1000 and WM2000 are ideal when users need to ac-  
cess the intercom system from strategic locations where a desktop station would be  
unsuitable, but they do not wish to carry around a belt-pack station. Since all of the  
intercom electronics are in the intercom station, the user need only connect a headset  
or telephone style handset to begin communicating. Alternatively, a headset or tele-  
phone handset can be left at the station.  
9
TOP  
8
CLOSED (ON)  
DIP SWITCH  
POSITIONS  
OPEN (OFF)  
FRONT  
11 (4 Places)  
TM  
Listen  
2
WM2000  
Call  
3
GRN 1  
RED 2  
Ch Select  
Talk  
4
1
6
5
Volume  
Headset  
BACK  
9
Ch 2  
Ch 1  
10  
7
SW1  
Figure 1. Reference view, WM2000 shown (See numbered features list)  
4
 
 
Features  
1. Channel Select Switch (WM2000 Only): Used to switch between intercom chan-  
nels one and two. The switch lights green for channel one and red for channel two.  
2. Intercom Listen Key: Both momentary (push-to-listen) and latching (hands-free  
listen) are possible.  
3. Call Key: Used to send call signals on the intercom channel and to indicate in-  
coming calls.  
4. Intercom Talk Key: Both momentary (push-to-talk) and latching (hands-free  
talk) are possible. Additionally, the WM1000 / WM2000 has a feature called  
"mic kill receive" which lets an operator at a remote master station (such as the  
US2000A) turn off the talk key.  
5. Dynamic-Mic Headset Connector: 4-pin male XLR connector accepts headsets  
with monaural headphones and either a balanced or unbalanced dynamic micro-  
phone.  
6. Volume Control: Adjusts intercom volume to headphones.  
7. Audiocom / Clear-Com* Selector Switch: The selector switch sets the intercom  
station for compatibility with either Audiocom or Clear-Com channel connector  
pin-outs, channel power requirements, and call signaling requirements.  
8. Configuration DIP switches: DIP switches are provided to enable/disable the fol-  
lowing features:  
Call Beep: An optional call beep tone can be used for incoming call notification.  
Headset Microphone Type Selection: Balanced or unbalanced microphone  
may be selected.  
DC call enable: This may be turned on to use the intercom station with inter-  
com systems that use DC call signaling.  
9. Connections Terminal Block: Used to connect intercom channel(s) and an op-  
tional local power supply.  
10. Sidetone Trimmers: These are used to adjust the level of the station operator’s  
own voice in the headphones.  
11. Mounting Holes: The mounting holes fit any standard, two-gang electrical box.  
* Brand names mentioned are the property of their respective companies.  
5
 
 
Audiocom®  
Installation  
Unpacking  
Each WM1000 / WM2000 is supplied with 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 intercom  
station.  
Quantity  
Description  
1
1
1
4
WM1000 or WM2000 Intercom Station  
Warranty and registration card  
User Instructions  
Mounting Screws  
Configuration Switch Pre-check  
Before making connections, read the configuration switch notes that follow and  
make sure that all switches are properly set for your intended usage. Table 1 lists the  
switch descriptions and factory default settings. Figure 1 shows the locations of the  
switches.  
DC Call Enable (DIP Switch 2)  
Leave this switch in the open position for Audiocom applications. Set it to the closed  
position if the WM1000 / WM2000 will be used in a Clear-Com intercom system.  
Incoming Call Beep (DIP Switch 3)  
By default, incoming calls are indicated by a red-flashing Call key and a beep tone in  
the headphones. If you do not want the beep tone, set DIP switch 3 to the closed po-  
sition.  
Headset Microphone Type Selection (DIP Switch 4)  
If the headset specifications indicate the microphone type is balanced, or if you are  
unsure, leave this switch in the open (default) position. If the specifications indicate  
an unbalanced microphone set DIP switch 2 to closedn.  
6
 
 
Table 1. Configuration Switch Settings  
Switch  
Number  
Description  
Settings  
Open=Off; Closed=On  
Default  
Setting  
1
2
Not used  
Don't care  
Open  
Open  
Closed: DC  
Open: Audiocom  
Call signal method  
Incoming call beep  
Microphone type  
Closed: Disabled  
Open: Enabled  
3
4
Open  
Open  
Closed: Unbalanced  
Open: Balanced  
5
6
7
8
Not used  
Not used  
Not used  
Not used  
Don’t care  
Don’t care  
Don’t’ care  
Don’t care  
Open  
Open  
Open  
Open  
Balanced/Unbalanced Switch (SW-1)  
This switch is set at the factory to the balanced (BAL) position for use with Audio-  
com intercom channels. Set the switch to the unbalanced (UNBAL) position for use  
with a Clear-Com intercom system. Be sure and use the appropriate connection in-  
formation based on how you have this switch set.  
Intercom Channel Connections  
Important!  
The following paragraphs and illustrations describe installation of the WM1000 /  
WM2000 in an Audiocom Intercom System. To use the WM1000 / WM2000 in a  
Clear-Com Intercom System, set SW1 to the UNBAL position, set DIP switch 2 to  
the Closed position, and connect the Clear-Com channel wires using the Unbalanced  
Mode Intercom Channel pin-out information listed in the specifications (page 19).  
7
 
 
Audiocom®  
General Information  
After connecting intercom stations as described below, and before installing the  
mounting screws, connect a headset and perform the sidetone adjustment as de-  
scribed on page 10.  
The WM1000 and WM2000 mount in a standard two-gang electrical box. Some ex-  
ample intercom system configurations are shown in Figures 2 through 5, pages 12  
through 14. Detailed connections for the WM1000 and WM2000 are shown in Fig-  
ures 6 and 7, pages 15 and 16. There are two basic methods for connecting the  
WM1000 and WM2000: 1) using a phantom powered connection, and 2) using local  
power. The two methods are discussed below:  
Method 1: Phantom Powered Connection  
In this method, operating power and intercom audio are delivered to the WM1000 /  
WM2000 over the same wires. The advantage of this setup is simplicity of connec-  
tion. Also, the Audiocom power supply automatically provides what is known as a  
terminating impedance for the intercom system. Without this terminating impedance,  
the sound quality on the channel will be very distorted, and the levels will shift every  
time additional stations are connected to the channel. The disadvantage of the phan-  
tom power method is that some operating power is lost over very long intercom ca-  
bles, and performance will then be reduced at remotely located stations. Generally, if  
the intercom stations are located within a few hundred feet of the power supply,  
phantom power will be sufficient. The actual distance over which power can be de-  
livered can vary, however, depending on the number of stations connected. Increasing  
the number of stations will reduce the distance. Note that the range over which power  
can be delivered is independent from the range over which audio can be sent. Audio  
can be transmitted for several miles, providing that intercom stations are locally pow-  
ered as described below.  
8
 
Method 2: Locally Powered Connection  
Using this method, the intercom station is connected to the intercom line just like any  
phantom-powered intercom station, except that a local power supply is also con-  
nected. This local power supply is located right with the intercom station and pro-  
vides power for that station only. Since power loss on the intercom lines is no longer  
an issue, the operating range is now limited only by the audio transmission range,  
which is several miles. Another advantage to this method is that more stations can be  
connected to the intercom channels. When local power is supplied to an intercom sta-  
tion, the station detects this and automatically disconnects from the phantom power  
supply. As long as an Audiocom power supply is located somewhere in the intercom  
system, the proper terminating impedance will still be supplied for all stations.  
All Locally Powered Intercom Stations (Dry Lines)  
If all intercom stations are widely distributed, you can dispense with a main power  
supply and use local power for each station. When no power is delivered on the inter-  
com channels, this is known as dry-line operation. However, since an Audiocom  
power supply is not used, a line termination must be inserted in each intercom chan-  
nel for proper operation. Figure 5, page 14 shows an example of dry line operation.  
The required termination components are shown in Figure 8, page 16.  
Dynamic-Mic Headset Connection  
For headset specifications, see page 18. For best results in noisy environments, a  
noise canceling (directional or cardioid) microphone is highly recommended.  
1. Make sure that DIP switch 4 is properly set for balanced or unbalanced micro-  
phone. See Table 1, page 7.  
2. Plug the headset into the headset connector. Power up the intercom system and  
check the sidetone adjustment before placing the station in operation.  
9
 
 
Audiocom®  
Power-Up  
Make sure any local power supplies are plugged in, and turn on the power switches  
of any phantom power supplies.  
If you are using a large number of locally powered intercom stations, you should  
activate their local power supplies before activating any phantom power supply.  
Otherwise, you may get an overload indication on the phantom supply. In this  
case, either reset the phantom supply, or momentarily turn it off, then on.  
Sidetone Adjustment  
The WM1000 and WM2000 use full-duplex audio (the same as conventional tele-  
phone lines) in which the talk and listen audio are sent and received on the same  
wires. Thus, when you talk on a channel, you will also here your own voice back in  
the headphones. If you are using open-ear style headphones, this could cause un-  
wanted feedback, since the microphone may pick up your returned voice audio and  
re-amplify it. 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 muf-  
fled sensation when talking. The sidetone adjustment is different for these two situa-  
tions.  
If you are using open-ear style headphones, adjust sidetone as follows:  
1. Activate channel 1 as described in the operating instructions. (Required only for  
the WM2000, the WM1000 is active on whichever channel it is connected to.)  
2. Activate talk and listen as described in the operating instructions.  
3. Slowly increase the volume to maximum while talking into the microphone.  
4. Using a small flat-bladed screwdriver, adjust the channel 1 sidetone trimmer (Fig-  
ure 1) to minimize your voice level in the headphones.  
5. For the WM2000 only, activate channel 2 and repeat the above steps to adjust  
the channel 2 sidetone.  
10  
 
 
6. Install the intercom station mounting screws after completing the adjustments.  
The station is now ready for use.  
If you are using headphones that completely enclose the ears, adjust sidetone as  
follows:  
1. Activate channel 1 as described in the operating instructions. (Required only for  
the WM2000, the WM1000 is active on whichever channel it is connected to.)  
2. Activate talk and listen as described in the operating instructions.  
3. Set the volume control to the normal listening level for intercom audio.  
4. While talking into the microphone, use a small flat-bladed screwdriver to adjust  
the channel 1 sidetone trimmer (Figure 1) so that you can hear your own voice in  
the headphones at an acceptable level.  
5. For the WM2000 only, activate channel 2 and repeat the above steps to adjust  
the channel 2 sidetone.  
6. Install the intercom station mounting screws after completing the adjustments.  
The station is now ready for use.  
11  
 
Audiocom®  
500 METERS  
Audiocom  
WM1000  
Audiocom  
Audiocom  
WM2000  
Listen  
Call  
Listen  
Listen  
Call  
WM2000  
Call  
GRN  
RED  
1
2
GRN  
RED  
1
2
Talk  
Ch Select  
Talk  
Ch Select  
Talk  
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
WM1000  
WM2000  
WM2000  
LOCAL POWER  
12 to 15 VDC, 65 to 150 mA  
Audiocom  
WM2000  
Audiocom  
Audiocom  
Listen  
Listen  
Listen  
Call  
WM1000  
WM2000  
Call  
Call  
GRN  
RED  
1
2
GRN  
RED  
1
2
Ch Select  
Talk  
Talk  
Ch Select  
Talk  
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
PS2000L  
WM2000  
WM1000  
WM2000  
PS2000L  
RESET  
1
2
Figure 2. A two-channel intercom system using one PS2000L Power Supply set to  
isolate mode. In isolate mode, each intercom channel is a separate party line, and  
total current for each channel is limited to 1 amp. Note that both WM1000 and  
WM2000 stations may be connected, depending on each locations’ need to  
communicate with one or two channels. WM1000 stations may be connected to either  
channel one or two. Also note that locally powered stations may be connected. This  
is recommended when stations are installed at remote locations. Since the PS2000L  
provides termination for the intercom channels, no user-installed termination is  
required. For WM1000 connection details refer to Figure 6; for the WM2000, refer to  
Figure 7  
Audiocom  
Audiocom  
Audiocom  
WM1000  
Listen  
Call  
Listen  
Call  
Listen  
Call  
WM1000  
WM1000  
Talk  
Talk  
Talk  
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
WM1000  
WM1000  
WM1000  
WM1000  
WM1000  
WM1000  
PS2000L  
RESET  
1
Audiocom  
Audiocom  
Audiocom  
Listen  
Listen  
Listen  
WM1000  
WM1000  
WM1000  
2
Call  
Call  
Call  
Talk  
Talk  
Talk  
R
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
Figure 3. A single-channel intercom system using one PS2000L with WM1000  
Intercom Stations. The PS2000L may be set to either combine or isolated mode. In  
combine mode, all intercom stations talk on a single party line, and total current for  
the channel is 2 amps. In isolate mode, one string of intercom stations is operated  
as channel one, and the other string is operated as channel two. There is no  
communication between the separate channels, and the total current per channel is  
1 amp. For WM1000 connection details, refer to Figure 6.  
12  
 
 
Audiocom  
WM2000  
Audiocom  
WM2000  
Audiocom  
WM2000  
Listen  
Listen  
Listen  
GRN  
RED  
1
2
GRN  
RED  
1
2
GRN  
RED 2  
1
Ch Select  
Talk  
Ch Select  
Talk  
Ch Select  
Talk  
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
WM2000  
WM2000  
WM2000  
WM2000  
WM2000  
WM1000  
Audiocom  
WM2000  
Audiocom  
Audiocom  
Listen  
Listen  
Listen  
WM1000  
WM2000  
GRN  
RED  
1
2
GRN  
RED  
1
2
Ch Select  
Talk  
Talk  
Ch Select  
Talk  
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
CHANNEL 1  
PS2000L  
CHANNEL 2  
100-240 VAC 60/50 HZ  
100-240 VAC 60/50 HZ  
CHN  
1
CHN  
1
CHN  
WIRING 1.5A 24VDC  
2
CHN  
WIRING 1.5A 24VDC  
2
MADE IN USA  
MADE IN USA  
PS2000L  
CLASS  
2
CLASS  
2
Audiocom  
Audiocom  
WM2000  
Audiocom  
WM2000  
Listen  
Listen  
Listen  
WM1000  
GRN  
RED  
1
2
GRN  
RED  
1
2
Talk  
Ch Select  
Talk  
Ch Select  
Talk  
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
WM2000  
WM2000  
WM2000  
WM2000  
WM1000  
WM2000  
Audiocom  
Audiocom  
Audiocom  
Listen  
Listen  
Listen  
WM2000  
WM2000  
WM2000  
GRN  
RED  
1
2
GRN  
RED  
1
2
GRN  
RED 2  
1
Ch Select  
Talk  
Ch Select  
Talk  
Ch Select  
Talk  
Volume  
Volume  
Volume  
Headset  
Headset  
Headset  
Figure 4. A two-channel intercom system using two PS2000L power supplies. Each  
PS2000L is set to combine mode and it supplies power to one intercom channel  
only. Each intercom channel is a separate party line, and total current for each  
channel is limited to 2 amps. Note that both WM1000 and WM2000 Intercom  
Stations may be connected, depending on each locations’ need to communicate  
with one or two intercom channels. For WM1000 connection details refer to Figure  
6; for the WM2000 refer to Figure 7.  
13  
 
Audiocom®  
Audiocom  
Listen  
Audiocom  
WM2000  
Audiocom  
WM2000  
Listen  
Call  
Listen  
Call  
WM1000  
Call  
Talk  
GRN  
RED  
1
2
GRN  
RED  
1
2
Ch Select  
Talk  
Ch Select  
Talk  
Volume  
Headset  
Volume  
Volume  
Headset  
Headset  
WM1000  
LOCAL POWER  
WM2000  
WM2000  
LOCAL POWER  
LOCAL POWER  
12 to 15 VDC, 65 to 150 mA  
12 to 15 VDC, 65 to 150 mA  
12 to 15 VDC, 65 to 150 mA  
LINE  
TERMINATION  
Audiocom  
Audiocom  
WM2000  
Audiocom  
WM2000  
Listen  
Listen  
Call  
Listen  
Call  
WM1000  
Call  
GRN  
RED  
1
2
Talk  
GRN  
RED  
1
2
Ch Select  
Talk  
Ch Select  
Talk  
Volume  
Headset  
Volume  
Volume  
Headset  
Headset  
WM2000  
WM1000  
WM2000  
LOCAL POWER  
12 to 15 VDC, 65 to 150 mA  
LOCAL POWER  
12 to 15 VDC, 65 to 150 mA  
LOCAL POWER  
12 to 15 VDC, 65 to 150 mA  
Figure 5. An example of an intercom system using all local powered stations, with  
no power being distributed on the intercom channels (dry lines). WM2000 stations  
are shown, but WM1000 stations may also be used. Since an Audiocom power  
supply is not used, the installer must connect a line termination somewhere in each  
channel for proper operation. The required line termination is shown in Figure 8.  
14  
 
 
TO ADDITIONAL  
TO POWER  
SINGLE-CHANNEL STATIONS  
SUPPLY CONNECTOR  
Channel Audio high / Power  
Channel Audio low / Power  
Pair 1  
Pair 2  
DC Common  
Shield*  
Shield*  
PIN 1  
OPTIONAL LOCAL  
POWER SOURCE  
12 to 15 VDC, 65 to 150 mA  
+ DC  
COMMON  
Cable Type: 22AWG Stranded, 2-Pair Twisted-wire, with Shield  
Denotes twisted pair.  
Denotes shield.  
*Shield: Earth ground (Connect at power supply only.  
Do not short to DC common)  
Figure 6. Audiocom mode connections for a WM1000 Intercom Station  
15  
 
 
Audiocom®  
TO ADDITIONAL  
TO POWER  
SINGLE- OR TWO-CHANNEL STATIONS  
SUPPLY CONNECTOR  
Channel 2 Audio low / Power  
Pair  
Pair  
Pair  
Channel 2 Audio high / Power  
Channel 1 Audio low / Power  
Channel 1 Audio high / Power  
DC Common  
Shield*  
PIN 1  
Shield*  
OPTIONAL LOCAL  
POWER SOURCE  
12 to 15 VDC, 65 to 150 mA  
+ DC  
COMMON  
Cable Type: 22AWG Stranded, 3-Pair Twisted-wire, with Shield  
Denotes twisted pair.  
Denotes shield.  
*Shield: Earth ground (Connect at power supply only.  
Do not short to DC common)  
Figure 7. Audiocom mode connections for a WM2000 Intercom Station  
Channel audio low  
Channel audio high  
Resistors 300 Ohm, 1/4W  
Capacitors 22 µf, 35V  
Non-polarized Electrolytic  
Common  
Figure 8. Audiocom mode line termination for dry-line operation. (One required for  
each channel.)  
16  
 
 
Operation  
Channel Select (WM2000 Only)  
Tap the Ch Select key to select channel 1 or 2. The key is green when channel 1 is se-  
lected and red when channel two is selected.  
Receiving Calls  
1. When there is an incoming call signal the Call key will flash red. There will also  
be a beep tone in the headphones if the beep feature is activated (page 6).  
WM2000 only: incoming call indication is provided only for the currently se-  
lected channel.  
2. Turn on the Talk and Listen keys and begin your conversation. Turn the keys off  
when finished.  
You can turn the talk and listen keys on in either momentary or latched mode.  
For momentary operation, press and hold the key. For latched operation, tap the  
key to turn it on. Then tap it again to turn it off when finished.  
Calling an Intercom Channel  
1. WM2000 only: select the desired intercom channel.  
2. Press and hold the Call key. An inaudible call signal will be sent, and the Listen  
key will automatically turn on.  
3. When you hear a response, release the Call key and activate the talk key.  
4. Turn off your Talk and Listen keys to end the conversation.  
17  
 
 
Audiocom®  
Specifications  
General  
Power Requirements:  
Phantom Power: 24 VDC nominal (12 to 30 VDC), 65 to 150 mA  
Local Power: 12 to 15 VDC, 65 to 150 mA  
Dimensions: Mounts in standard two-gang electrical box  
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  
Pin 2  
Pin 3  
Pin 4  
Microphone low  
Microphone high  
Headphone high  
Headphone low  
Intercom Channels, Balanced Mode (SW1 set to BAL position)  
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%  
Receive: 20 kHz ±800 Hz, 100 mVrms  
Mic-Kill Detect Frequency: 24 kHz ±800 Hz, 100 mVrms  
Noise Contribution: less than -70 dB  
Common Mode Rejection Ratio: greater than 50 dB  
Connector Type: Six-position terminal block with screw-in wire clamps  
Pin 1  
Pin 2  
Pin 3  
Pin 4  
Pin 5  
Pin 6  
Audio and DC Common  
Local power (12 to 15 VDC, 65 to 150 mA)  
Intercom channel 1 audio low and +24 VDC phantom power  
Intercom channel 1 audio high and +24 VDC phantom power  
Intercom channel 2 audio low and +24 VDC phantom power  
Intercom channel 2 audio high and +24 VDC phantom power  
18  
 
 
Intercom Channel, Unbalanced Mode (SW1 set to UNBAL position)  
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: Six-position terminal block with screw-in wire clamps  
Pin 1  
Pin 2  
Pin 3  
Pin 4  
Pin 5  
Pin 6  
Common  
Local power (12 to 15 VDC, 65 to 150 mA)  
Channel 1 +24 VDC input  
Channel 1 Intercom audio high and DC call  
Channel 2 +24 VDC input  
Channel 2 Intercom audio high and DC call  
19  
 
 
Audiocom®  
Factory Service and Parts Information  
When returning equipment for repair include your return address, telephone number  
and proof of date of purchase, along with a description of the problem.*  
The address for Audiocom equipment returns and parts information is:  
Service Department  
Telex Communications, Inc.  
West 1st Street  
Blue Earth, Minnesota 56013 U.S.A.  
Telephone: (507) 526-3205  
(Collect calls not accepted)  
Warranty Repairs - If in warranty, no charge will be made for the repairs. Equipment  
returned for warranty repair must be sent prepaid and will be returned prepaid.  
Non-Warranty Repairs - Equipment that is not under warranty must be sent prepaid  
to Telex. If requested, an estimate of repair costs will be issued prior to service. After  
your approval and completion of the repairs, the equipment will be returned on a col-  
lect basis. Collect charges may be avoided by sending a signed check for payment in  
full along with your signed estimate approval form (shipping charges are included in  
the estimate).  
* For sales / technical support and system design contact:  
Pro Audio Sales Department  
Telex Communications, Inc.  
9600 Aldrich Avenue South  
Minneapolis, Minnesota 55420 U.S.A.  
Telephone: (612) 884-4051  
(Collect calls not accepted)  
20  
 
 
Notes  
21  
 
Audiocom®  
Notes  
22  
 
Notes  
23  
 
®
TELEX COMMUNICATIONS, INC.  
9350-7621-000 Rev. C, 10/98  
9600 Aldrich Ave. So., Minneapolis, MN 55420 U.S.A.  
 

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