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1
Intent & Scope
This document describes the installation procedure for the MAI-625 Master Audio Interface.
2
Description
The MAI-625 Master Audio Interface is a Voice over Internet Protocol (VoIP) device for DXL
intercom systems and is used to facilitate the integration of a variety of intercom master station
components into a console or control panel.
The MAI-625 provides three separate RJ-25 connectors in support of an SMK-126/136 Panel
Mount Handsfree Speaker/Microphone Kit, an HHK-136 Handset/Hookswitch Kit, and an
HSK-136 Headset Kit. These kits provide handsfree audio, a privacy handset, or a headset
interface, and can be installed in any combination desired. Please refer to their individual
datasheets for further information.
The MAI-625 also includes a line-level input and output to facilitate making audio connections
to an existing system. The line level output can also connect to an amplifier for driving
external powered speakers. A status input, and a DPDT control relay are also available. These
signals are provided on terminal blocks with the line-level output (also) brought out to a 3.5
mm stereo audio jack.
A combination of these audio devices can be used. If more than one audio/input device is connected to the MAI
the hookswitch and headset switch will determine which speaker receives audio and which microphone is active.
If the hookswitch is off hook the speaker audio is connected to the handset speaker and handset microphone
audio is connected to the microphone audio lines. If the hookswitch is on hook the speaker audio is connected to
either the headset or handsfree speaker depending on the state of the headset switch. If the headset switch is
closed (corresponding to having a headset jack plugged in) the headset microphone is active and the speaker
audio is connected to the headset. If the hookswitch is on hook and the headset switch is open then handsfree
operation is possible. Figure 1 describes the operation of the hookswitch and headset switch.
Figure 1. Operation of Hookswitch and Headset Switches
Document IM-MAI-625-`1.0
INSTALLATION
INSTRUCTIONS
MAI-625 Master Audio Interface
Headset SWITCH
CLOSED
OPEN
HOOKSWITCH
OFF
ON
HOOK
HOOK
HEADSET
HANDSET
HANDS
HANDSET
FREE
2012 Harding Instruments - Printed in Canada
MicroComm DXI
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Table of Contents
Summary of Contents for Harding MicroComm DXI MAI-625
- Page 1 Figure 1 describes the operation of the hookswitch and headset switch. HOOKSWITCH HOOK HOOK HEADSET SWITCH CLOSED HEADSET HANDSET HANDS OPEN HANDSET FREE Figure 1. Operation of Hookswitch and Headset Switches 2012 Harding Instruments - Printed in Canada Document IM-MAI-625-`1.0...
- Page 2 MAI-625 Master Audio Interface The MAI-625 has provisions for a line level output that can be used to drive speakers via an external amplifier. The following table summarizes the audio resource priorities Priority Device Audio Resource Input: Handset Microphone Highest Handset Output: Handset Speaker (Line Out disabled) Input: Headset Microphone...
- Page 3 MAI-625 Master Audio Interface Wall Mounted MAI-425 Master Audio Interface The MAI-625 can be either wall mounted using the 0.15” diameter holes and #6 screws or mounted on a DIN rail using the 4 holes for mating to a DIN railclip. (A 209-188 Mounting Foot for mounting on DIN Rail Wago 210 Series) 4.12"...
- Page 4 MAI-625 Master Audio Interface Wiring Diagram for MAI-625 The following diagram shows the wiring required to connect up the Headset, Handset, and Handsfree Speaker/Microphone kits to an MAI-625. RJ-25 Male Plug VOLUME Handsfree Speaker/Microphone Kit SMK-126 Headset Kit Headset HSK-136 Status Reset RJ-25 Male Plug...
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Page 5: Network Connections
MAI-625 Master Audio Interface Field Connection Network Connections Although the PSE (Power Source Equipment) must use the pin pairs assigned to an endspan or midspan (not both) the PD (Powered Device) must have the capability to accept power from either the endspan or midspan device. -
Page 6: Other Connections
MAI-625 Master Audio Interface 5.2.2 Handset Hookswitch The handset speaker and microphone with hookswitch and PTT connect via an RJ-25. The Handset Hookswitch Kit (HHK-136) is available to facilitate the installation. RJ-25 Pin Function Mic + Push to Talk (PTT +) Spk + Spk - HKSW +... -
Page 7: Status Indicator
MAI-625 Master Audio Interface TB-04 Function Line Out + Line Out - Line In + Line In – (Gnd) Table 8: Line Input/Output 5.3.3 Status Input An unsupervised input is supported via a two pin terminal block. The status input is required for the audio bridging function.
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