VDP900ST
3
VELLEMAN
b. DMX-512 Chain with termination
A DMX terminator is recommended for installations where the DMX cable has to run a long distance or is in an
electrically noisy environment (e.g. discos). The terminator prevents corruption of the digital control signal by
electrical noise. This device features a built-in DMX terminator, which is activated by means of the red DIP switch on
the device. Switch it in the ON position if the device is the last device in the chain.
c. Projector DMX start address selection
All DMX-controlled devices need a digital start address so that the correct device responds to the signals. This digital
start address is the channel number from which the device starts to “listen” to the DMX controller. Set the correct
number by means of the DIP switches on the device.
You can use the same starting address for a whole group of devices or enter an individual one for every device.
When all devices have the same address, all the units will “listen” to the control signal on one particular channel. In
other words: changing the settings of one channel will affect all devices simultaneously. If you set different
addresses, each device will “listen” to a separate channel number. Changing the settings of one channel will only
affect the device in question.
In the case of the 2-channel VDP900ST, the start address of the first device should be 1, that of the second 3 (1 + 2),
that of the third 5 (3 + 2) etc.
d. Function selection
There are 9 DIP switches ; the way these are set determines the operation mode of the device.
Music control
This function sets the device to music-controlled. Switches 1-9 must be OFF. Flash intensity and rate can be set
manually by means of the rotary controls.
DMX address setting
The 9 switches determine the DMX address. They each have a different value, which is always one more than the
sum of all switches before it. This means switch 1 has value 1, switch 2 has value 2, switch 3 has value 4, 4 is 8, 5 is
15, 6 is 32, 7 is 64, 8 is 128 and 9 is 256. Take the address you want to give to the device and start counting from
switch 9 to 1, selecting the values that need to be added along the way. Set the corresponding switches to ON. The
maximum value is 511 (all 9 switches are ON).
For example: address 95 is 111110100 (1 + 2 + 4 + 8 + 16 + 0 + 64 + 0 + 0)
There are 2 additional red DIP switches. One is for the DMX terminator. The other is to select the mains AC voltage
frequency (50 or 60 Hz). For Europe, set the switch to 50 Hz ; for the USA, set the switch to 60 Hz.
6. Cleaning and Maintenance
1. All screws should be tightened and free of corrosion.
2. The housing, the lenses, the mounting supports and the installation location (e.g. ceiling, suspension, trussing)
should not be deformed, modified or tampered with e.g. do not drill extra holes in mounting supports, do not
change the location of the connections …
3. Mechanically moving parts must not show any signs of wear and tear.
4. The electric power supply cables must not show any damage. Have a qualified technician maintain the device.
5. Disconnect the device from the mains prior to maintenance activities.
6. Wipe the device regularly with a moist, lint-free cloth. Do not use alcohol or solvents.
7. There are no user-serviceable parts, apart from the lamp (see “
4. Installation
”).
8. Contact your dealer for spare parts if necessary.
