MA Digital Dimmer User Manual - page 14
MA Lighting Technology GmbH . Dachdeckerstr. 16 . D-97297 Waldbüttelbrunn . Fax: + 49 9 31 4 97 94 29 . www.malighting.de
14
14
14
14
14
7. In- and Outputs
7.1 DMX In- and Output
The DMX input and -output conforms to the USITT DMX 512 (1990) standard. Every unit, which works
according to this norm, can control the MA Digital Dimmer.
In addition the DMX input is protected against overvoltage with suppressor diodes and conforms to the
RS485 or RS 422a norm.
The DMX output is wired 1:1 (all 5 Pins) to the DMX Input.
Pinout:
pin 1 = Ground (not connected with earth)
pin 2 = Data -
pin 4 = n.c.
pin 3 = Data +
pin 5 = n.c.
Please note that all DMX units are connected one after the other and no Y-connections are con-
structed. At the end of the DMX line a termination resistor between pin 2 and pin 3 (100 Ohm) must be
connected.
The DMX adjustments as DMX address etc. are made in the menus (s. chapter 4.2 + 4.4)
In the dimmer the hardware is already included which makes it possible to send DMX data to be read
externally via the DMX interface. But this function is only possible when the new DMX norm will be
adapted. Every dimmer then will need to have its own address (unit number).
The way of working is as follows:
A light control desk or a special controller sends out a special code on the DMX line and switches its
own DMX transceiver off. Then the controller switches to receive data by "listening into" the DMX line.
Now the dimmer can send out its data (temperature, loadcheck, phase voltage etc.).
These can be received and evaluated by the controller.
7.2 Analogue Input (0...10 Volt)
Every light control desk which produces a control voltage of 0...10 Volt can be connected to the
dimmer. Please don´t forget to connect also the "ground" to pin 15.
Ground and earth are not connected and should be kept separate to avoid current loops which cause
disturbance between the light control desk and the dimmer.
Earth is connected with the metal case of the Sub-D and should only be connected to the cable shield.
The input impedance is 50 kOhm.
The pinout of the 15 pin Sub-D connector is pin 1...12 = channel 1...12, Ground is pin 15.
The analogue input will be switched off automatically when DMX is received.
7.3 MIDI input
Via the MIDI input all playback functions of the memory menu can be started (OFF, Chaser and
MEMORY 1...12").
Standard program change commands are accepted (0...14).
The MIDI transmitter, e.g. a MIDI footswitch, must be connected to the MIDI IN socket by using a MIDI
cable. The MIDI THRU socket is necessary to send the MIDI data to further dimmers or other MIDI
equipment.