Artistic Licence micro-scope 3a - Data Error; Loop through

Artistic Licence Engineering Ltd. Micro-Scope 3a user guide
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DATA ERROR
This character cell is clear when good data is being received. If
an error occurs, one of the following is displayed:
S
DMX512 is being received with a non-matching Start code. The
Start Code is selected using menu 4 – “Select Start Code”.
F
Data is being received with Framing errors. This can be caused by
noise pick-up and also occurs when the phase pins of the connector
are reversed.
O
Data is being received with Overrun errors. This can be caused by
noise pick-up and also occurs when a phase pin is disconnected.
T
The received data is outside the DMX512 Timing specification.
This display occurs when either the number of channels per frame
exceeds 512, or the Break time is less than 88uS, or the MaB time
is less than 4uS.
LOOP
THROUGH
This character cell displays 'L' when Micro-Scope's output is
providing a clean and buffered version of the incoming DMX512.
When the character cell is clear, Micro-Scope's DMX512 generator
is connected to the output.