User guide

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The AL4800 is designed to use 1.8º per step motors. The
reference motor is a 12V stepper motor: Japan Servo Co Ltd
KH42HM2B013. (Farnell 586-389)
The motor control channels are defined as follows:
Motor Function Type Drive Mode
1 Pan Bi-Polar Micro-Step Constrained
2 Tilt Bi-Polar Micro-Step Constrained
3 Colour Uni-Polar Micro-Step Continuous
4 Gobo Uni-Polar Micro-Step Continuous
5 Dowser Uni-Polar Half-Step Constrained
Sensors
The motor channels use the following sensing methods to detect end
stops or zero positions:
Motor Function Sensor
1 Pan Overdrive motor into end stop
2 Tilt Overdrive motor into end stop
3 Colour Hall Effect or Mechanical
Switch
4 Gobo Hall Effect or Mechanical
Switch
5 Dowser Overdrive motor into end stop
DMX512
Control
The five motors are position controlled based on the DMX512 input
levels. Two operating modes are available and programmed via the
Mode input. Mode 1 is selected with the Mode pin hi or floating.
Mode 2 when the pin is connected to ground.
DMX
Channel
Name Level Mode 1 Mode 2
1 Pan 0-255 Full range of motor as set by
PanSel1/2. Full range is calibrated on
power up by driving the motor from
end to end.
2 Tilt 0-255 Full range of motor as set by
TiltSel1/2. Full range of motor. Full
range is calibrated on power up by
driving the motor from end to end.