2.2.9. RS-232 Hardware Configuration:
RS-232 serial interface for control and configuration of the M3. Port settings are 115.2k
baud, No Parity, 8 Bits, 1 Stop Bit. NOTE: 9.6k baud rate is a factory set option. This port is
designed for communication with a local user or controller over a short reliable interface.
No error detection scheme is implemented over this interface. All command characters and returned
information are in ASCII format. When connected properly, the system prompt M3> will be returned.
Rx Receive
Tx Transmit
COM Ground
The plug is a spring clamp style termination that accepts up to 16 gauge wire. To insert wire, insert
a jewelers screwdriver into the upper section of the connection until the spring clamp opens in the
lower section. Insert the uninsulated wire, and remove the screwdriver causing the clamp to grab
the wire.
2.2.10. USB
connector
USB type “A” connector for use with a USB memory key. The M3 will upload or download audio files
to or from the USB key based on the folder names on the key. See descriptions of supported folder
names:
“Complete”:
ALL files on the M3 will be deleted and replaced with audio files in this folder.
“Delta”:
Audio files of the same name will be replaced with files in this folder.
“Upload”
: When the M3 unit detects a memory key with only an empty Upload folder, and not other
folders, all audio files will be copied from the M3 into this folder on the memory key.
If both a “Complete” and a “Delta” folder exist on the key, no audio files will be transferred and an
error indication will be displayed on the LEDs.
2.3.
M3.1 Enhanced Configuration and Features:
The M3.1 is the base model of the M3 family. All configuration and features for this model are covered in
Section 2.2.
2.4.
M3.1+1 Enhanced Configuration and Features:
The M3.1+1 offers all the configuration and features of the base system with the addition of a second
independent balanced stereo audio output and associated start contacts. Controls for channel 1 are
denoted by CH1.
2.4.1. CH 2, Audio Out:
Two, three terminal pluggable connectors.
L -
Left audio output, inverting
L
Left audio output ground
L +
Left audio output, non-inverting
R -
Right audio output, inverting
R
Right audio output ground
R +
Right audio output, non-inverting
M3 supports balanced audio output. If unbalanced(single ended) is desired, use audio output non-
inverting and audio output ground.
The plug is a spring clamp style termination that accepts up to 16 gauge wire. To insert wire, insert
a jewelers screwdriver into the upper section of the connection until the spring clamp opens in the
lower section. Insert the uninsulated wire, and remove the screwdriver causing the clamp to grab
the wire.
M3 User's Manual V 1.0 Revised 13, Sept 2011
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