Wheatstone E-SAT, Technical Manual

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page 2 – 18
E-Series Network / Apr 2007
H A R D W A R E
Logic Input/Output Card
(LIO-NC4)
Overview
The LIO-NC4 is a programmable hardware interface with a feature set
designed for broadcast studio control applications. Each Logic card provides
twelve ports that may be programmed as inputs or outputs using SW1 -SW3
dipswitches. The twelve independent, opto-isolated solid state relay inputs/
outputs may be programmed through the XPoint Logic Configuration form to
function as routable logic or triggered ports.
Routable logic allows the user to make logic signal crosspoints in the same
way audio crosspoints are made. For instance, a closure on logic input port 1
can be cross connected to logic output port 1. Later, the same closure on input
port 1 can be routed to logic output port 2, 3, or 4, etc. as required. The output
ports may be programmed to follow the input port state or to invert it. Defining
this behavior is useful when configuring the hardware for normally closed
applications. Input and output ports may be configured as logic I/O only or
may be “attached” to an audio signal. Routable logic signals may be included
as part of a Salvo.
Triggered ports allow the user to program a logic input to fire a predefined
Salvo or to make a temporary audio connection. Salvos make or break
multiple audio and/or logic crosspoints, while temporary audio connections
are useful for IFB or EAS applications. Note that triggered ports serve one,
predefined function and are not routable.
See “Configuring Logic I/O” in the Software Setup guide.
Input Ports
Each of the twelve LH1522AB solid state relay
input ports are configured as a floating photodiode,
with the + input going to the opto’s anode, and
the - input to opto’s cathode. A 475 ohm current
limiting resistor in series with each negative input
supports an external supply voltage range of +5Vdc
to +15Vdc. For external supply voltages between
+15Vdc and +24Vdc, install a current limiting resis-
tor of 220 ohms in series with each + input connec-
tion. Maximum forward photodiode current is 50mA.
When interfacing to a logic input port, we recommend the positive side be
connected to a fixed, positive dc voltage and the negative side switched to
ground to activate the logic input.
EXT
+5V - +15V
ROUTER
SIMPLE INPUT EXAMPLE
LIO IN
!
Default Setting
Card 1 is configured as
inputs. Card 2 is config-
ured as outputs.