Ampro NEO PROTON IP 12 QA Manual De Usuario página 13

Connection of the DMX line
DMX connection employs standard XLR connectors.
Use shielded pair-twisted cables with 120Ω im-
pedance and low capacity. The following diagram
shows the connection mode:
DMX-INPUT
XLR plug
ATTENTION
The screened parts of the cable (sleeve) must never
be connected to the system's earth, as this would
cause faulty fixture and controller operation.
Over long runs can be necessary to insert a DMX
level matching amplifier.
For those connections the use of balanced micro-
phone cable is not recommended because it cannot
transmit control DMX data reliably.
• Connect the controller DMX input to the DMX
output of the first unit.
• Connect the DMX output to the DMX input to
the following unit. Connect again the output to
the input of the following unit until all the units
are connected in chain.
• When the signal cable has to run longer dis-
tance is recommended to insert a DMX termina-
tion on the last unit.
Construction of the DMX termination
The termination avoids the risk of DMX 512 signals
being reflected back along the cable when they
reaches the end of the line: under certain condi-
tions and with certain cable lenghts, this could
cause them to cancel the original signals.
The termination is prepared by soldering a 120Ω
1/4W resistor between pins 2 and 3 of the 5-pin
male XLR connector, as shown in figure.
Pin1: GND - Shield
Pin2: Negative
Pin3: Positive
Pin4: N/C
Pin5: N/C
DMX-OUTPUT
XLR socket
English version - Neo Proton IP 12 QA
P. 13