ETC Unison Mosaic Show Control - Manual (Page 11)

11
The DMX ports are by default not isolated from the MSC’s ground connection which is
the recommended configuration for driving isolated inputs - the majority of DMX
receivers.
If required this may be changed by removing the top cover of the MSC and removing the
jumper marked ‘JP1’, located to the right of the DMX ports. The two DMX ports will then
be optically isolated from the MSC’s internal circuitry although not from each other.
• Digital/Analog Inputs
The MSC features 8 digital/analog inputs on one 16 way connector. To connect an input
signal to the MSC, one connection should be made to the desired input pin, marked '1' to
'8', and the other should be made to the adjacent signal ground pin.
The inputs can be individually configured via Designer to operate in one of three modes:
Contact closure: An external volt-free switch may be connected between the input pin
and the signal ground pin.
In this mode, the input pin is internally pulled-up to 5V via a 2.2Kohm resistor, so the
switch only needs to be rated at 5V, 2.5mA or greater.
Digital input: An external voltage source (such as a 12V trigger output) may be
connected between the input pin and the signal ground pin.
In this mode, the input pin is internally pulled down to 0V via a 2Mohm resistor and the
maximum input voltage supported is 24V.
The MSC may be configured to specify what the 'high' and 'low' threshold voltages are. This
facility can be used to provide 'Schmitt trigger' action.
Analog input: An external voltage source (such as a 0-10V analog signal) may be
connected between the input pin and the signal ground pin.
In this mode, the input pin is internally pulled down to 0V via a 2Mohm resistor and the
maximum input voltage supported is 24V.
The MSC may be configured to specify what the input voltage range is. Voltages inside this
range are reported as 0% to 100%.
In all modes, the maximum rated input voltage is 24V. The inputs should never be driven
with a higher voltage nor negative voltage or damage may occur.
In all modes, all signal ground pins are connected together internally. The digital/analog
inputs are not isolated from each other nor the MSC’s power supply. If isolation is
required, it must either be provided by the connected device or a separate isolator should
be used.
MSC