Velleman VM138 User Manual
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Terminator:
The DMX protocol implies that the last device in a series must be fitted with a 120 ohms terminator.
The module has already been fitted with the terminator. Activate it as follows: position DIP switch nr 10 to
ON. The terminator must be deactivated in all other devices which means it must be positioned to OFF.
1. Position switch 10 of SW1 to ON when using the MODULE as sole connected DMX device or when this
module is the last device in a series (see “Terminator”).
2. Connect a 12V regulated power supply to input 12VDC (SK1) and switch on.
3. The green power LED LD1 will light when the module is turned on.
4. When increasing the DMX value of the channel over 140, the relay will activate and LD3 “OUT” will light.
LD3 will turn off and the relay will deactivate when decreasing the DMX value under 120. Values between
120 and 140 serve as hysteresis and keep the relay from cycling.
ON
DMX channel