Eletech QuickWave EM38A-M User Manual

EM38A-M / EM38AR-M / EM38AX-M User's Manual
Available Models
EM38A-M: standard model
EM38AR-M: + 8 relays for simple control
EM38AX-M: + 8 relays for full control
EM38A-M-TCP: Ethernet TCP support
EM38AR-M-TCP: Ethernet TCP support
EM38AX-M-TCP: Ethernet TCP support
Technical Specifications
Manual Version
9.3.1
Firmware Version
9.3
Control Interface
Modbus RTU
Operation Mode
Audio playback with optional relay outputs
Sound File Format
MP3 (ISO 11172-3 up to 44.1KHz)
Max. Number of Sound Files
1000
Memory Card Type/Capacity
SD/SDHC up to 2GB/32GB
Max. Total Audio Time
16.5 hours/GB @ 128 kbps
Supply Voltage
12 ~ 30 VDC
Typical Standby Current
60 mA
Audio Output
(30V supply, 8 Ohm load, 10% THD+N)
High efficiency class D
Stereo: 15W per channel
Mono: 55W bridge tied load (BTL)
Relay Rating (EM38AR-M & EM38AX-M)
15A @ 125 VAC
10A @ 250 VAC
6A @ 28 VDC
Physical Dimensions
EM-38A-M: 5.3'' x 4'' x 1.35''
EM-38AR-M & EM-38AX-M: 5.3'' x 6.7'' x 1.35''
Inputs, Outputs & Controls
Power Light (PWR)
The power light is turned on when power is applied.
Trigger Inputs Terminals: T1 - T8, GD
Unused.
Reset Input Terminal: RS
Pull this input down to the ground momentarily to reset the unit. Min. duration is 100 ms.
Busy Output Terminal: BY
This open collector output is automatically turned on while playing audio, with a maxi-
mum sink current of 200 mA.
Power Input Terminals: V+, GD
Use a well regulated DC power supply to obtain the best sound quality. Power can also be
supplied via the 2.1mm center positive coaxial jack.
Line Output (LINE): 1/8" Stereo Phone Jack
This jack provides single ended line output.
Balance Knob (BAL)
This knob adjusts the output balance between the two channels. It should be set at the
middle (center detent) if the unit is configured for BTL (bridge tied load) mono out.
Volume Knob (VOL)
This is the hardware volume control. Turn this knob clockwise to increase the audio
volume. It affects both the speaker and the line out.
The Modbus protocol also provides software based volume control. The audio level
goes through the software control first, then the hardware control.
Serial Port (DB9 Female)
The serial port supports both RS232-MODBUS (default) and 2W-MODBUS interfaces.
To select 2W-MODBUS, the internal jumper JP1 must be moved to the "485" setting.
Relay Output Terminals (EM38AR-M & EM38AX-M)
Three terminals are provided for each relay output: NC (Normally Closed), NO (Nor-
mally Open) and Common. The contact is rated at 12A/120VAC or 10A/24VDC.
Speaker Connections
Regular Stereo Virtual Surround Stereo
The left channel is internally inverted therefore the left speaker must be connected back-
wards for regular stereo output. The inversion can be disabled if needed - see System
Configuration File.
Regular Mono BTL Mono (4X Output Booster)
BTL mono is used to boost output at low supply voltage - don't use speakers lower than
8 Ohms to avoid overloading the power amp.
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