ZETRON 4000 Series, Installation Manual

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Common Control Equipment Installation
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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
transmitting. 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 A to 0.8V when active, and will
tolerate no more than 12V when inactive. While the X-Busy Input is active, the “BSY-I”
indicator on the channel card is on. If enabled through switch, the X-Busy Input will also
mute the channel audio when the input is active.
Base Station Installation
For single frequency/single receiver base stations, connect the Tx and Rx audio pair. See
Figure 14 on 69 and Figure 15 on 70 for the location of the connections on the punch-
down block.
For two transmitter/multiple frequency base stations, see
T2-2R Base Station Installation
on page 228.
Auxiliary I/O Card Installation (Optional)
Overview
The Auxiliary Input/Output Card (Part # 950-0293) is designed to provide a means for the
Series 4000 Communications Control System to monitor external on/off inputs and
control external on/off outputs. Each Auxiliary I/O card contains 12 SPST relay outputs, 8
optically isolated inputs, and 32 non-isolated inputs. The Model 4020 and Model 4048
system supports up to six Auxiliary I/O cards, providing a total of 72 outputs and 240
inputs.
The Auxiliary Input/Output Card has an IRIG B decoder as well as a power line 50-60
hertz timekeeping circuit. A console clock can be accurately synchronized to either the
IRIG B encoder or the 50-60 hertz from the power line (use a 9-12 VAC output step-down
transformer). Timing input can be connected to any one of the six cards. Only one kind of
timing input should be connected to an Auxiliary Card.
Warning! Do not parallel a DC Dual Channel Card with a Tone Control
Dual Channel Card. The interface could be damaged.
STOP