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1. OVERVIEW
1.1. Features and Capabilities
The Federal Signal M2 system is the most flexible series of high fidelity, multi-channel solid state digital
audio playback systems available to the industry.
The M2 retrieves MPEG audio data from non-volatile PCMCIA FLASH memory, eliminating the need for
battery backup, and delivers superb full bandwidth sound quality.
The M2 is offered in the following configurations:
Model # Description
M2.1 Single Balanced Stereo audio channel, 10 message
input selections, RS232, wall mount package
M2.1+1 Dual Balanced Stereo audio channels, 10 message
input selections each, RS232, wall mount package
M2.2 Single Balanced Stereo audio channel, 20 message
input selections, RS232, wall mount package
M2-RM-x M2 rack mount packaging. 1U package contains power
supply and houses up to 3 M2 modules. Must be
ordered as a system, not field upgradable.
Messages are stored on PCMCIA FLASH memory cards(sold separately). Messages are randomly and
instantly accessible. Dynamic Message Length (DML) technology has been incorporated in the M2
allowing each of the messages to be of different duration. DML also provides for replacement messages
to be a different length than the original, maximizing memory efficiency and compatibility with future
applications.
Messages are stored in MPEG I, Layer II format. Composer software allows a Windows computer to
create entire programs with .WAV files then converts them to MPEG. The MPEG files then may be
copied to the a PCMCIA drive on the computer or downloaded directly to the M2 over the RS232 port
Message playback is controlled by simple contact closures or by RS232 commands. Audio outputs are
balanced and level is controlled via potentiometers. Form C relay connections are provided to indicate
that the M2 is playing.
The M2 offers several different playback modes to accommodate different applications. Play/repeat,
Play once per closure, Play while active, and Retrigger allow the user to customize input logic. Message
repetition and delay between messages are user selectable as well.
The M2's small size, industrial construction and the absence of moving parts makes it ideal for
automatic unattended operation, especially in harsh environmental or mobile conditions.
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1.2. General Specifications
Audio Quality
Sample Rate: 48kHz
Dynamic Range: 90dB
Frequency Resp.: 20Hz - 20kHz
THD: <0.01% at 1kHz
Audio Output
Type: Balanced, analog
Mode: Stereo or dual mono*
Connection: Pluggable euro terminals
Level: +4dB max., 150 ohm
Adjust: Potentiometer
Audio Memory
Type: Dos format PCMCIA FLASH
Power
Input Voltage: 12VDC @ 1 amp
Connection: 2 pin euro terminal
Audio Data Formats
Compressed: MPEG 1, Layer II
MPEG Data
Rates(mono): 7kHz = 32k bits per sec.
15kHz = 64k bits per sec.
20kHz = 128k bits per sec.
Control I/O
Control Inputs: Individual message start,
stop
RS232: 9600 baud(115.2K optional),
No parity, 8 bits, 1 stop bit
Relay Outputs: Playing
Interface: Euro terminals
Mechanical
Wall Mount/Table top - 5.7"W x 12" L x 2.4" H
Rack mount(optional) - 1U
Chassis - aluminum extrusion, painted
M2
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