railSplit uno User Guide
Page 7
Protection and Reporting
The DMX512 output surge protection contains a sacrificial element that will fail after a certain
number of protection events (see Specification on page 8). When this failure occurs, the output
will short together all 3 terminals.
Output short-circuit is monitored and reported by the product as follows:
Indicator
Tally output
The bottom LED indicator shows the monitoring status as follows:
y
OFF = The product is analysing the output or there is no DMX512 input
y
Green = DMX512 output is operating normally
y
Red = DMX512 output is short-circuit. This indicates that either there is a short-circuit on
the DMX512 output or that the sacrifical protection has failed.
A tally output is provided to allow protection status to be monitored remotely. The tally output is
open-collector allowing multiple products to connect to a single reporting signal.
The output is designed to drive 12 VDC at 5 mA without an additional external resistor.
y
To drive 24 VDC add a 2k2 external resistor.
y
To drive 48 VDC add a 5k6 external resistor.
The output is as follows:
y
Float = The product is analysing the output or there is no DMX512 input or DMX512 output
is operating normally
y
Sink = DMX512 output is short-circuit. This indicates that either there is a short-circuit on
the DMX512 output or that the sacrifical protection has failed.
