Lectrosonics LE Series - Manual (Page 6)

REAR PANEL DESCRIPTION
LOGIC INPUTS 1-8 - The Logic Inputs provide the input for a contact closure (or other means) to indicate to the
LE8 what filter set should be loaded. A contact closure (i.e. a short) between the Logic Input "+" and Logic Input "-"
is needed to activate the input (this is referred to as "active low logic"). Logic Input "+" is connected through a 10K
Ohm resistor to the internal +5 Volt supply, and Logic Input "-" is connected to the internal digital ground. Any
contact closure (or other means) used must be able to conduct 0.5 mA continuous DC current. The Logic Inputs
are pre-assigned a priority to prevent confusion when two or more channels
are active. Logic Input 8 is the highest priority input, and Logic Input 1 is the
lowest. For example, if both Logic Inputs 2 and 4 were simultaneously
active, the filter set for Logic Input 4 will be loaded.
LINK OUT - The Link Out connector provides a means to use more than one
LE8 in an installation. This terminal should be connected to the Link In
terminal of the next LE8 used in systems where more than one LE8 is used.
The Link Out of that LE8 should be connected to the Link In of the next LE8,
and so on. (See page 7 for wiring detail.)
LINK IN - The Link In connector, in conjunction with the Link Out connector,
provides a means to use more than one LE8 in an installation. This terminal
should be connected to the Link Out terminal of the previous LE8 used in
systems where more than one LE8 is used.
INPUT - The Input connector is a standard female balanced 3-pin XLR. Pin
2 is signal "+", Pin 3 is signal "-", and Pin 1 is ground. The Input may be
used either balanced or unbalanced. If the Input is used unbalanced, a 2
wire plus shield type cable should be used. Refer to the diagram below for
the proper wiring for unbalanced inputs and outputs.
THRU - The Thru connector (a male 3-pin XLR) parallels the Input connector,
and is used for daisy chaining the input signal to the LE8 on to other devices.
Note that since the Thru is directly parallel to the Input, if the Input is run
unbalanced, the Thru will also be unbalanced.
OUTPUT - The Output connector is a standard male balanced and floating 3­
pin connector. Pin 2 is signal "+", Pin 3 is signal "-", and Pin 1 is ground.
The Output may be used either balanced or unbalanced. If the Output is
used unbalanced, a 2 wire plus shield type cable should be used. Refer to
the diagram below for the proper wiring for unbalanced inputs and outputs.
LE8
UNBAL IN/OUT
SHIELD 1
2
SIG +
3
SIG ­
(Shield)
Figure 6 - Wiring for unbalanced use. LE 8
LINK IN
LINK OUT
AUDIO
INPUT
AUDIO
THRU
AUDIO
OUTPUT
AUDIO PROCESSOR
8
7
6
5
4
3
2
1
INPUTS
LOGIC
PATENT NO: 5,206,913
Figure 5 - LE8 Rear Panel
5