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MedeaWiz® Sprite® 4K
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Serial Port Control from your Show Controller or Micro-processor
For simple file playing, the serial codes are the same as the codes for the earlier MedeaWiz®
models. You must have a file named 000. Name others 001, 002, etc.. Set the Play Mode to
Video Control Mode for video files, or Audio Control Mode for audio files. Set the Control Mode
to Serial Control. Set the Baud Rate to match your external controller.
Serial communications is on the 3.5mm 4 pole jack at 2400, 4800, 9600, 19200, 38400, 57600,
115200, 921600, or 1500000, 8N1 at 3.3 to 5 Volt TTL levels. The factory default is 9600 baud.
Lower baud rates can be more reliable if you are using relatively long serial cables.
Send one byte, Decimal 1 (Binary 0000 0001, Hex 01) to play file 001.xxx. Send Decimal 2
(Binary 0000 0010, Hex 02) to play file 002.xxx and etc. Do not send any other bytes such as a
line-feed or a carriage return. Send only one byte. Make sure your program is sending the
NUMERICAL value, not the character (CHAR) value. Many programs default to sending the
character unless you specify otherwise. The number 1 sent as a CHAR is actually Decimal 49 and
will play file 049.xxx if available.
The Sprite® 4K will report back to the Host controller according to your "Serial Feedback"
setting in the Setup Menu.
The Sprite® 4K can supply 5 Volts DC on the I/O port for your micro-controller at up to 100 mA.
A short on this supply may result in the internal fuse burning and will void the warranty.
Note that true RS232 levels from computers, some PLC's and some other devices use negative
voltages and will require a level translator like the MAX3232 series. Do not allow negative
voltage below ground to be applied to the Sprite® 4K. This will void the warranty.
Level translator example to convert real RS232 to TTL level
The MAX3232 can be powered from the Sprite® 4K. Connect all Grounds together.
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