Lab.gruppen PLM series Operation Manual page 61

In Auto Select mode, the control system inspects the input set as Priority 1 for a valid input signal. If none
is found, it will proceed to the input set as Priority 2, and so on until a valid input signal is found. This polling
process will also take place if the current selected input fails.
In Forced Selection mode, one of the four priorities is permanently "forced" to be the selected input,
whatever its input type.
The selected Router (Router 1 or Router 2) may be set to Auto Select mode or Forced Selection mode with
soft button 4. The rotary encoder scrolls between the following options:
▸ Auto Select (default)
▸ Force Priority 1
▸
Force Priority 2
▸ Force Priority 3
▸ Force Priority 4
Assignment of the inputs to the priority levels
A factory default setting assigns certain inputs to the four priority levels automatically. These assignments
are:
Input Router 1:
Priority 1: AES/EBU chapter1 (AES1)
Priority 2: Empty
Priority 3: Empty
Priority 4: Analog input 1 (Analog 1)
Input Router 2:
Priority 1: AES/EBU chapter2 (AES2)
Priority 2: Empty
Priority 3: Empty
Priority 4: Analog input 2 (Analog 2)
These assignments may be changed by pressing soft function buttons 5 – 8 and using the rotary encoder to
scroll through alternative options. It is important to appreciate that due to the signal type hierarchy inherent
in the input selection process, it is not possible to select an analog source to a higher priority than a digital
source. For this reason, analog sources are assigned to Priority 4 by the default setting. Note that Dante
inputs are not selectable from the front panel of the PLM; their assignment must be made from the Lake
Controller software.
Analog Input Sensitivity and Digital Gain Offset
The soft button adjacent to each of blocks 5 - 8 selects either the input source (Line 2) or the input sensitiv-
ity/digital gain offset (Line 3) for adjustment.
Line 3 of each block shows the currently set input sensitivity (in the case of the analog inputs) or digital gain
offset (in the case of the digital inputs). The maximum input level which can be accepted by the analog input
pre-amplifiers without clipping may be set to 12 dBu or 26 dBu.
Digital gain offset may be applied to AES/EBU digital input signals in 0.1 dB increments from -100 dB to +15
9. Front Panel Interface
PLM Series Operation Manual rev 1.1.3
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