Table of Contents
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1. Intent & Scope
This document describes the installation procedure for the MAI-125 Master Audio Interface.
2.
Description
The MAI-125 Master Audio Interface connects to the intercom system via an SAB-100 station audio board. The
MAI-125 provides an audio communication channel from a master station to a DXI exchange. The MAI is usually
used in conjunction with other devices, such as touch screen monitors or switch panels, that can provide display
as well as control inputs to the DXI system.
The MAI-125 provides interface connectors for telephone handset, hookswitch, speaker, microphone, headset and
phantom powered microphone. A combination of these audio devices can be used. If more than one audio/input
device is connected to the MAI the hookswitch and speaker/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
speaker/headset switch. If the speaker/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 speaker/headset switch is open then handsfree operation is possible with either an electret or
phantom microphone (but not both). The following table summarizes the operation of the hookswitch and
speaker/headset switch.
The MAI-125 has provisions for several press-to-talk (PTT) inputs. The PTT switches can be used to control the
audio direction of half duplex calls. The PTT inputs appear on the main DB-25 connector, the handset connector
and the headset connector. Although all inputs are in parallel, and perform the same function, the additional PTT
inputs simplifies interfacing wiring. For example a PTT switch can be located in the handset, on a graphics panel,
or a footswitch. If more than one type of PTT switch is used a switch closure on any one of the switches will cause
the MAI-125 to transmit audio to the device being called.
Document IM-MAI-125-2.2
INSTALLATION
INSTRUCTIONS
MAI-125 Master Audio Interface
SPEAKER/HEADSET
SWITCH
CLOSED
OPEN
HOOKSWITCH
OFF
ON
HOOK
HOOK
HEADSET
HANDSET
HANDS
HANDSET
FREE
© 1997 Harding Instruments - Printed in Canada
MicroComm DXI
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Table of Contents
Summary of Contents for DXI MicroComm DXI MAI-125
- Page 1 The MAI-125 Master Audio Interface connects to the intercom system via an SAB-100 station audio board. The MAI-125 provides an audio communication channel from a master station to a DXI exchange. The MAI is usually used in conjunction with other devices, such as touch screen monitors or switch panels, that can provide display as well as control inputs to the DXI system.
- Page 2 MAI-125 Master Audio Interface The MAI-125 provides a pair of contacts on the hookswitch connector that can be used for attaching a microphone muting switch. If the muting switch is closed all of the microphone inputs connected to the MAI are muted.
- Page 3 MAI-125 Master Audio Interface Handset Hookswitch SPKR / MIC Headset Phantom Powered MicroComm DXI Master Audio Interface MAI - 125 6.00" 1.80" 6.50" MAI Base Plate Showing Mounting Detail Electrical connections to the MAI are made with a single DB-25 connector. The MAI has a male connector and the mating cable requires a female DB-25 connector.
- Page 4 MAI-125 Master Audio Interface The interface module I/O port requires a female DB-25 mating connector with the following pin configuration: Signal Signal Main V + Main V + Main V - (Gnd) Main V - (Gnd) Earth Ground Speaker - Speaker + Microphone - Microphone +...
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Page 5: Off Hook
MAI-125 Master Audio Interface If the telephone hookswitch is used, it is wired to the interface module via an 8-pin MTA-100-08 male connector as given by the following table. This connector also provides two terminals that can be used to connect an external switch that allows all microphones to be muted. - Page 6 MAI-125 Master Audio Interface The telephone handset is wired to the interface module terminal block according to the following table: Signal Speaker + Speaker - (Gnd) PTT switch + PTT switch - (Gnd) Microphone + Microphone - (Gnd) Interface Module Handset Connector The telephone hand set must have an electret (or condenser) microphone.
- Page 7 MAI-125 Master Audio Interface For handsfree operation speaker and microphone connections are made through a 4-pin MTA-100 connector according to following table: Signal Speaker + Speaker - Microphone - (Gnd) Microphone + Interface Module Speaker/Microphone Connector Harding Instruments provides a Speaker/Microphone Kit SMK-130 that includes a loudspeaker and microphone mounted on a baffle plate.
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