IM-HDH-421-Pv1 - Harding Instruments

IM-HDH-421-Pv1 - Harding Instruments
MicroComm DXL
INSTALLATION
INSTRUCTIONS
HDH-421 Half-duplex Handset Station
1.
Intent & Scope
This document describes the installation procedure for the HDH-421 Half-duplex Handset Station.
2.
Description
The HDH-421 Half duplex Handset Station is a two gang intercom station with a 7-pin XLR receptacle and a
status LED. The intercom station is operational when 7-pin XLR plug of the HND-100 handset assembly is
plugged into the HDH-421 receptacle. A half-duplex audio connection is established between the handset and a
second intercom station. The HDH-421 status LED comes on to indicate that the audio connection has been
established. Pressing the handset push-to-talk (PTT) switch forces the station into microphone transmit mode.
When the handset is unplugged the intercom station reverts to normal operation and the LED goes off.
4.50"
Minimum Opening
3.625"W x 2.875"H x 1.75"D
1.81"
3.28"
4.50"
PUSH
LED
4 Mounting Holes 0.188" (3/16")
Figure 1 HDH-421 Half Duplex Handset Station
3.
Installation
A simplified diagram of the back view of the HDH-421 is shown below. The header CN1 is used to connect audio
and switch information from the station to the intercom system. The audio lines are connected to pins 1 and 2 of
CN1 with a 4-pin MTA-100-04 connector.
The maximum recommended distance to run 22-gauge twisted-pair shielded cable from a HDH-421 to an SCC401 is 2500 feet (750 meters).
Document IM-HDH-421-Pv1
 Harding Instruments - Printed in Canada
HDH-421 Half-duplex Handset Station
4.50"
1
2
3
4
Aud +
Aud Aud Aud +
Spkr +
Spkr-
2001 Harding Instrument Co. Ltd.
PC06713-04
4
3
2
1
10
9
8
7
6
5
4
3
2
1
Sw B In Switch B In +
Switch B Out Switch B Out +
4
3
2
1
Switch A In Switch A In +
Switch A Out Switch A Out +
-
SWB
+
+
CN2
4.50"
CN1
CN3
CN4
-
SWA
+
+
Figure 2 Rear View of HDH-421 Printed Circuit Board Showing Header Positions
3.1
Audio Connection from System to Intercom Station
Each HDH-421 station is connected to the exchange with a single shielded twisted pair. This pair is connected to
terminals on the field interface terminal block. All shields are terminated at the field interface teminal block. The
shields are grounded through the cable that connects the terminal block to the connector on the SCC-401 (for a
DXL system). The shield at the station end is left unconnected.
The connections to the intercom station are made with an AMP MTA-100 series connector. The intercom pair
should connect to pins 1 and 2 on a female 4-pin AMP MTA-100 series connector that plugs onto the header
labeled CN1 on the printed circuit board of the intercom station. To make these connections you should use an
AMP Handle Assy 58074-1 tool with a 58246-1 head. The cable should be cut to length and the shield and outer
jacket should be trimmed back about 1/2 inch. Ensure that the shield is not exposed or it may short out exposed
contacts on the intercom PCB when it is installed. The pin configuration of the station connector is:
MTA Pin
1
2
3
4
Signal
Audio +
Audio N/C
N/C
Figure 3 MTA Pin Signals
To insert the signal wires into the connector you remove the white cover from the connector, insert the connector
into the tool from the left side (it will travel through the tool in the direction indicated by the arrow), pull the
trigger once to load the connector. Then insert the signal wire for pin 1 (do not strip the wire) into the hole on the
top of the tool and pull the trigger to insert the wire into the connector. Then repeat to install the other signal
wire. Finally, remove the connector from the tool, replace the cover, and then slide the connector onto the pins on
the intercom station.
Page 2
Document IM-HDH-421-Pv1
HDH-421 Half-duplex Handset Station
3.2
Mounting the HDH-421 Station
The 2 gang HDH-421 is designed to mount to a standard 2-gang electrical box, with the faceplate connected to the
box by four #6-32 mounting screws. The box must have a minimum opening of 3.625"W x 2.875"H x 1.75"D (as
shown in the figure on page 1).
4.0
Configuring the HDH-421 using the DXL Administrator Software
The DXL Administrator Software is used to configure a
HDH-421 station. The Identification tab of the Station
Properties dialog box has entries for ID Number: and
Name: of the station. Using the pull-down menu the
station is configured as a Type: Speaker Station. The
SCC-401 port that the HDH-421 is connected to is
specified by the Exchange:, Box:, Card:, and Port: entries.
The Switches tab lists two switches labeled 1 and 2. Both
switches are required in an HDH-421 station. Switch 1 is
configured as a Call/End switch while switch 2 is
configured as a PTT switch.
Document IM-HDH-421-Pv1
Page 3
HDH-421 Half-duplex Handset Station
The Properties… button is used to bring up a Switch
Properties dialog box with two tabs. The Function: pull
down menu is used to select the function of the switch.
Switch 1 should be defined as a Call/End switch.
The Contact Type should be left at the default setting
MNO Momentary Normally Open.
The Settings tab is used to specify the station that you
will be connected to when the HND-100 Handset
station is plugged into the HDH-421. The Station pulldown menu will list all the stations in the system. From
this list select the appropriate station. When the HND100 is plugged into the jack on the HDH-421 the
Call/End switch is closed and a half–duplex audio
connection is made between the HDH-421 and the
selected station. When the handset plug is removed
from the jack the call connection is terminated.
The second switch in the HDH-421 configuration, which physically is the push-to-talk switch on the handset,
should be defined as a PTT switch.
The settings for the remaining tabs in the Station Properties dialog box for the HDH-421 station are discussed in
the MicroComm DXL Administrator Software and Local User Interface manual.
Page 4
Document IM-HDH-421-Pv1
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