Cloud Electronics 46-120TMedia - Manual (Page 19)

46-120 Installation and User Guide V1.2 19
The CDI-46 Installation Guide supplied with the card includes
examples of the most commonly-used commands. A full
RS-232 protocol document is available at
www.cloud.co.uk .
See also page 24.
Ethernet connection
The 46-120’s functions may also be controlled using TCP/IP
commands sent via the ETHERNET INTERFACE RJ45
connector (see [21] at page 12). Industry-standard Cat 5
cabling may be used.
The CDI-46 card can operate at either 10base-T or 100base-T
speeds, and auto-negotiates. The TCP/IP commands are the
same as the RS-232 command set; see the CDI-46 Installation
Guide and page 25 for more details.
The CDI-46 can also act as an Ethernet-to-serial bridge,
whereby the serial port transmits RS-232 commands to other
equipment on receipt of data received via the Ethernet port.
See also page 25.
Speaker outputs (Lo-Z)
The speaker output connector is an 8-pin, 5 mm-pitch screw-
terminal connector ([13] at page 12). Mating connectors
are supplied. The
power amplifier outputs for all four zones
are on this connector. If less than four zones are being used,
use as many of the mating 2-pin connectors as required.
Connect to speakers using pairs of terminals as shown in the
table:
Panel marking Connect to:
1 0V Zone 1 output ‘-‘
2 Z1 Zone 1 output ‘+‘
3 0V Zone 2 output ‘-‘
4 Z2 Zone 2 output ‘+‘
5 0V Zone 3 output ‘-‘
6 Z3 Zone 3 output ‘+‘
7 0V Zone 4 output ‘-‘
8 Z4 Zone 4 output ‘+‘
Each output stage is designed to drive into an impedance
of not less than 4 ohms. Check the impedance of the
loudspeaker(s) in use and, taking into account any series and/
or parallel wiring, ensure that the total load on each channel
is not less than 4 ohms.
100/70 V-line operation
The 46-120 may be used with 100 V/70 V-line loudspeaker
systems by the use of Cloud CXL-46T transformers.
These
are fitted internally, one per zone. Any or all zones may be
converted, and may be used with 100 V and/or 70 V-line
operation as required.
The same output connector is used for both Lo-Z
and 100/70 V-line operation. It is not possible to
drive loudspeaker systems of the two types
simultaneously from the same zone output.
In the 46-120T and 46-120T MEDIA model variants, four CXL-
46Ts are pre-installed at the factory, and wired for 100 V-line
operation (70 V-line for the US). This can be changed to
70 V-line operation (per-output) if wished by moving an
internal connector. Alternatively, the 46-120 or 46-120
MEDIA
may be modified for 100/70-V line operation by retrofitting
the transformers, which are available from Cloud Electronics
as an option. Installation instructions can be found at page
28, and a quick reference sheet is included with each
transformer.
When using the 46-120 for 100/70 V-line operation, the
65 Hz high-pass filters in each zone to be used in this mode
should be enabled. See page 23 for full details.
A checkbox area is provided below the connector to allow
the installer to indicate the configuration of each zone.
MOH/Utility output
The MOH/UTILITY OUTPUT (MOH = Music On Hold)
is an auxiliary output which can be used for various purposes.
The source is selectable by internal jumpers. The output is
available both as a transformer-isolated 600 ohm feed and a
non-isolated line level feed.
A common application for the isolated output is to provide
continuous music-on-hold programme to a telephone system.
The line level output may be used to drive additional external
power amplifiers, for example.
The output connector is a 4-pin 5 mm-pitch screw terminal
type ([14] at page 12), wired as follows:
PIN LABELLED USE
1 0V
LINE LEVEL Unbalanced 0 dBu output
2 +
3 -
600 OHM
ISOLATED
Isolated output for telephone
systems 4 +
Note that one pin of the line level output is connected
internally to 0 V.
The transformer-isolated output is suitable for connection to
a nominal 600 ohm load. The output level is nominally 0 dBu,
and the transformer provides full galvanic isolation from a
telephone system. It should be noted that a fixed hi-pass filter
is fitted in this output, to reduce bass frequencies when used
for this purpose.