DM2218C / EM2218C User’s Manual - Page 1 of 8
Models
DM2218C (version 1.5)
Board only, no enclosure.
EM2218C (version 1.5)
Board + metal enclosure.
Technical Specifications
Operation Mode
playback only
Sound File Format
Windows WAV (uncompressed PCM)
- 6, 8, 11.025, 16 or 22.05 KHz
- 8 bit depth
- monaural
Max. Number of Sound Files
Parallel / Direct Mode: 8
Parallel / Binary Mode: 128
Parallel / Sequential Mode: 512
Parallel / Round-Robin Mode: 8
Parallel/Script Mode: 512
Serial Control: 512
Memory Type
CompactFlash card, type I
Max. Memory Capacity
> 1 GB
Max. Recording Time
> 1 hour
Supply Voltage
6 VDC, or 9 ~ 12 VDC
Typical Standby Current
30 mA (Mute mode)
50 mA (Standard mode)
Max. Audio Output
1W (8 Ohm load)
Serial Interface
RS-232
Parallel Interface
8 inputs, CMOS logic level
Physical Dimensions
DM2218C (board only)
3.0” x 4.2” x 0.9”
EM2218C (board + metal case)
3.3’’ x 4.6’’ x 1.2”
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. By default, the
board is set to accept a 9~12 VDC supply voltage with jumper J3 at the “12V” position. If the
supply voltage is 6 VDC, move jumper J3 to the “6V” position.
Speaker Output Terminals: S1 & S2
This is a 1-watt bridged (balanced) output. Minimum load is 8 Ohm.
Speaker Output Jack: 1/8” Mono Phone Jack
This is a 1/4-watt single ended (unbalanced) output. Minimum load is 4 Ohm.
Busy Output Terminal: BY (available on internal connector P2 only)
This is an open collector output. It drops to about 0.2V when the board is playing. Maximum
sink current is 100 mA. When controlling an external relay with this output, be sure to add a
diode to protect the driving transistor.
System Reset Terminal: RS (available on internal connector P2 only)
Short terminal RS to the ground to reset the board. Minimum reset duration is 100 ms.
Parallel Input Terminals: T1 - T8
These inputs are internally pulled up to +5V through 10K resistors, and protected with 1K in-
line resistors. The Parallel Input 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 balanced and the
unbalanced outputs.
Serial Port: DB9 Female
The Serial Port supports RS-232 and is disabled by default.
Typical wiring diagram for push button activation.
