Eletech EM3038A User Manual

EM3038A / EM3038A-R / EM3038A-X User's Manual -
Available Models
EM3038A (version 2.5)
Audio only, no relays.
EM3038A-R (version 2.5)
Audio + relays for simple control.
EM3038A-X (version 1.6)
Audio + relays for complex animation.
* Em3038A-X supports WAV files only.

Technical Specifications

Operation Mode
playback only
Sound File Format
Windows WAV (uncompressed PCM)
MP3 (ISO 11172-3)
Max. Number of Sound Files
Parallel / Direct Mode: 8
Parallel / Binary Mode: 128
Parallel / Sequential Mode: 792
Parallel / Round-Robin Mode: 8
Parallel / Script Mode: 999
Serial Control: 999
Memory Type
Type I CompactFlash card formatted with
FAT16 or FAT32 file system
Max. Memory Capacity
2 GB for FAT16
2 TB for FAT32
Max. Recording Time (w/2GB card)
33 hours (near CD quality MP3)
200 minutes (CD quality WAV)
Supply Voltage
10 ~ 32 VDC
Typical Standby Current
150 mA
Max. Audio Output
10W/channel (4 Ohm load)
Serial Interface
RS-232 / RS-485
Parallel Interface
8 inputs, CMOS logic level
Physical Dimensions
EM3038A
6.0'' x 4.8'' x 1.7"
EM3038A-R & EM3038A-X
6.0'' x 7.5'' x 1.7"
User's Manual Parts
Part One: parallel interface
Part Two: serial port & application notes
* Part Two is available upon request.
Interface Descriptions
Power Input Terminals: VD & GD
Use a well regulated DC power supply to obtain the best sound quality. Connect the power
supply's positive output to terminal VD, and the negative output to terminal GD.
Speaker Output Terminals: LF (left channel) & RT (right channel)
The speaker outputs are single ended (unbalanced). Depending on the ambient tempera-
ture, additional heat ventilation may be required to obtain maximum output. If the built-in
power amplifier is not to be used, it can be disabled by moving the on-board jumper J3 to the
OFF position.
Busy Output Terminal: BY
This output is manually controlled when the system runs in the Script mode. In all other
modes this signal is automatically turned on during the playback of any file. The output is
open collector and internally pulled up to +5V through a 10K resistor (R11). It drops to about
0.2V when activated, sinking current up to 100 mA. When controlling an external relay with
this signal, be sure to remove resistor R11, and add a protection diode as shown in the
diagram below.
System Reset Terminal: RS
Short terminal RS to the ground to reset the board. Minimum reset duration is 100 ms.
Parallel Port Terminals: T1 - T8
These inputs are internally pulled up to +5V through 10K resistors, and protected with 1K in-
line resistors. The Parallel Port is enabled by default.
Power Light (PWR)
The power light is turned on when power is applied.
Volume Pot (VOL)
Turn the knob clockwise to increase the output volume. It affects both the speaker output
and the line output.
Line Output (LINE): 1/8" Stereo Phone Jack
This jack provides single ended line output for external amplification.
Serial Port: DB9 Female
The default serial mode is RS-232. To select RS-485, move the internal jumper J2 to the
"485" setting. Note that the Serial Port is disabled by default.
Relay Output Terminals (EM3038A-R & EM3038A-X only)
Three terminals are provided for each relay: NC (Normally Closed), NO (Normally Open)
and Common (the center terminal). The contact is rated at 12A/120VAC or 10A/24VDC.
Typical wiring diagram for push button applications
Part One / Page 1 of 4