Console Installation
32
Auxiliary Output
This open-collector output pulls to ground when the standby-base feature for the channel
is activated. This output will sink 500 mA to 0.8 V when active, and will withstand no
more than 12 V when inactive. Ground is provided for the return path.
Transmit Audio +/-
This is the balanced source for transmit audio. Normally, the impedance of this output is
600
Ω
, however, with the replacement of a jumper, this output can be made to go to 3500
Ω
when not actually sourcing audio. This can be useful for paralleling control stations on the
same set of wires. The output is isolated for voltages up to 1500 V
AC
.
The TX Audio signal wires are also used for receiving audio in a 2-wire system. The 2-
wire receive sensitivity may be adjusted to -30 dBm using the 2W RX adjustment on the
channel card.
Receive Audio +/-
This is the balanced input for receive audio in a 4-wire system. Normally, the impedance
of this input is 600
Ω
, however, with the replacement of a jumper, this input can be made to
go to 10,000
Ω
useful for paralleling multiple control points. The output is isolated for
voltages up to 1500 V
AC
. The 4-wire receive sensitivity may be adjusted to -30 dBm using
the 4W RX adjustment on the channel card edge.
Cross-Busy Input/Output
This input/output pair is used for cross-busy handshaking for multiple parallel control
point arbitration. The X-Busy Output sinks current to ground when the channel is being
transmitted upon. The X-Busy Input inhibits transmission on the channel while the input is
grounded (or within 1 volt). The output will sink up to 0.5 amperes at 0.8 V when active,
and will tolerate no more than 12 V when inactive. The input represents a 3300
Ω
load to
+12 V
DC
but will withstand up to 25 V across its signal. While the X-Busy Input is active,
the BSY-I indicator on the channel card will be on. If enabled via the BTI and CCM DCC
DIP switch segments (and the Bsy-Out connector block terminals are wired to the
appropriate Bsy-In terminals), the X-Busy Input will mute the audio of the channel when
the input is active.
Note
The transmit audio level may be adjusted close to +10 dBm using
the TX adjustment on the channel card.
Tip
The transmitting console will not busy itself out, even with its Busy
Output connected to its Busy Input. This reduces the complexity of
the wiring by allowing the installer to MUX those outputs and inputs
together, not having to keep them separate.
