Gai-tronics 69439-001 DATASHEET
Pub. . DS69439-001
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 69439-001 External Audio Interface
General Information
This data sheet applies to the GAI-Tronics Model 69439-001 External Audio Interface (EAI), which
allows multiple audio paths to be interfaced to a SmartSeries system. It is installed in a 10457 Series
Card Rack and is controlled by a 69440 Series MCU installed in that same card rack. The EAI is
designed exclusively for use in SmartSeries systems.
The EAI contains a series of front panel LEDs that reflect current operating conditions. Connections to
the EAI card are typically accessed via two 26-pin terminal block modules mounted inside the system’s
control cabinet. A ribbon cable connects each terminal block module to the rear of the card rack housing
the EAI card.
Audio Inputs
The 600-ohm audio input 1, 600-ohm audio input 2, 600-ohm audio input 3, and 600-ohm audio input 4
provide four audio inputs to the system. These inputs may be independently routed to one of the
following five card rack audio busses: evacuation, page resource 1, page resource 2, party line 1, or party
line 2. The EAI is not able to mix audio sources, therefore only one audio input may be connected to a
particular card rack audio bus at a time.
Audio Outputs
The 600-ohm audio output 1 and 600-ohm audio output 2 provide two audio outputs from the system.
These outputs may be independently routed from one of the following four card rack audio busses: page
resource 1, page resource 2, party line 1, or party line 2. The EAI is not able to mix audio sources,
therefore only one card rack audio bus may be connected to a particular audio output at a time.
Contact Inputs
The contact closure input 1, contact closure input 2, contact closure input 3, and contact closure input 4
provide four supervised contact closure inputs to the system. Each input is activated by a switch closure.
The switch wiring is monitored for open or short circuit faults. A resistor network must be installed at the
switch to enable the cable monitoring. These inputs are typically used in conjunction with an audio input
and are used to assign a broadcast destination and a paging priority to the audio source.
Contact Outputs
The contact closure output 1, contact closure output 2, contact closure output 3, and contact closure
output 4 provide four voltage-free , solid-state contact closure outputs from the system. Each output can
switch a maximum load current of 50 mA. The output activation is controlled by the system MCU. The
activation times are defined by the system’s software programming.
The EAI contains a 1.00 kHz sine wave detector for use in the supervision of several internal audio paths.
The EAI contains two 2-wire to 4-wire conversion circuits for accessing the party line 1 and party line 2
card rack audio busses. Each of those two card rack busses has a dedicated circuit.
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
V
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Pub. DS69439-001
Model 69439-001 External Audio Interface Page: 2 of 2
Specifications
Electrical
Board
Power ............................................................................................... 575 mA maximum @ +5 V dc ±10%
150 mA maximum @ +12 V dc ±10%
150 mA maximum @ -12 V dc ±10%
1.0 kHz Sine Wave Detectors
NOTE: Use a card rack audio bus when measuring amplitude.
In-range frequency....................................................................................... (within) inside 1.00 kHz ±1%
In-range amplitude on card rack audio bus.......................................... inside 4.24 V
Out-of-range frequency............................................................................. (beyond) outside 1.00 kHz +
Out-of-range amplitude on card rack audio bus................................. outside 4.24 V
600-Ohm Audio Input
Audio input voltage................................................................................. 2.82 Vpp (1.00 Vrms) maximum
Audio input to card rack audio path frequency response............................... 250 Hz to 12.0 kHz ±1.5 dB
Audio input to card rack audio path distortion + noise........................... THD + noise <0.5% @ 1.00 kHz
Audio input impedance.......................................................................... ≥24 kΩ from 250 Hz to 12.0 kHz
Audio detect level for LED................................................................. 282 mVpp (100 mVrms) maximum
Audio not detected threshold for LED............................................... 28.2 mVpp
600-Ohm Audio Output
NOTE: Each audio output requires an external 600Ω load resistor for proper operation.
Audio output voltage.................................................................................. 2.82 Vpp (1.00 Vrms) ±1.5 dB
Card rack audio path to audio output frequency response............................. 250 Hz to 12.0 kHz ±1.5 dB
Card rack audio path to audio output distortion + noise......................... THD + noise <0.5% @ 1.00 kHz
Audio output impedance..................................................................................................... 600 Ω nominal
(1.50 V
pp
) ±1.5 dB
rms
3%
(1.50 V
pp
(10.0 mVrms) minimum
) ±4.5 dB
rms
Contact Closure Output
Open resistance............................................................................................................................. ≥1.0 MΩ
Closed resistance............................................................................................................................... ≤50 Ω
Load voltage................................................................................................ 350 Vp (245 Vrms) maximum
Load current........................................................................................... 71 mAp (50.0 mArms) maximum
Contact Closure Input
Open resistance....................................................................................................................... 20 kΩ ±10%
Closed resistance.................................................................................................................... 5.0 kΩ ±10%
Environmental
Temperature range (operating/storage)............................................... +32° F to +122° F (0° C to +50° C)
Relative humidity:................................................................................................ 10–85% non-condensing
Mechanical
Unit dimensions............................................. 10.3 H × 0.780 W × 9.07 D inches (262 × 19.9 × 231 mm)
Unit weight .................................................................................................. 0.892 lbs. nominal (0.405 kg)
Approval
CE Mark
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