RCF SB 3320 Bedienungselemente Seite 12

CONNECTING THE "M2" TERMINAL STRIP
The M2 terminal strip (ref. 14 – Fig. 1) is used for the output of the balanced low level audio signal, and is connected as shown
in Figure 3 on page 33.
TERMINAL STRIP
NOTE
• When the M2 terminal strip of the SB 3320 board is used, the M4 terminal strip of the RB 3300 board must not be used.
CONNECTING THE "M4" TERMINAL STRIP
The M4 terminal strip (ref. 5 – Fig. 1, page 32) is used for the input of the signal for speakers, and is connected as shown in
Figure 3 on page 33.
TERMINAL STRIP
IMPORTANT NOTE
• Always use cables that have an adequate cross-section for the current to be carried and suitable insulation for the voltage of
the speaker line.
CONNECTING THE "M5" TERMINAL STRIP
The M5 terminal strip (ref. 4 – Fig. 1, page 32) is used for the output of the signal for speakers, and is connected as shown in
Figure 3 on page 33.
TERMINAL STRIP
IMPORTANT NOTE
• Always use cables that have an adequate cross-section for the current to be carried and suitable insulation for the voltage of
the speaker line.
CONNECTING THE "M3" TERMINAL STRIP
The M3 terminal strip (ref. 12 – Fig. 1, page 32) makes it possible to control the FIRE-BREAK function, and is connected as
shown in Figure 3 on page 33. For the electrical control element, it is necessary to use a normally closed contact (e.g. contact
of a pushbutton): one terminal of the contact is connected to the earth (GND) of the 24 Vdc continuous voltage that supplies
the respective RB 3300 board; the other terminal is connected to one of the two terminals of the M3 terminal strip. When the
contact is opened, the emergency signal is transmitted with absolute priority, and the normally transmitted signal is
excluded. The FIRE-BREAK function remains enabled as long as the contact is kept open.
NOTE
• The two terminals of the terminal strip are connected together, which simplifies the connections when it is necessary to con-
nect the M3 terminal strips of the various boards in series (in/out connection) in order to enable the FIRE-BREAK function on
several SB 3320 boards by means of a single command.
CONNECTING THE "M1" TERMINAL STRIP
The M1 terminal strip (ref. 13 – Fig. 1, page 32) is used for the input of the audio signal that must be transmitted when the
FIRE-BREAK function is enabled, and is connected to the output of the emergency source as shown in Figure 3 on page 33.
TERMINAL STRIP
NOTE
• In order to be able to transmit the same emergency message by means of multiple SB 3320 boards, connect the M1 termi-
nals of the various boards to the same source. To prevent earth loops and humming, on the cables that interconnect the M1
terminal strips of the various boards, connect the screen to the terminal strips only on one end.
FUNCTION OF TERMINALS
M2 N.1: audio signal GND
N.2: "hot" balanced audio signal (low level)
N.3: "cold" balanced audio signal (low level)
FUNCTION OF TERMINALS
M4 N.1: + high level audio signal (e.g. 25 V – 50 V – 70 V – 100 V)
N.2: - high level audio signal (e.g. 25 V – 50 V – 70 V – 100 V)
FUNCTION OF TERMINALS
M5 N.1: + high level audio signal (e.g. 25 V – 50 V – 70 V – 100 V)
N.2: - high level audio signal (e.g. 25 V – 50 V – 70 V – 100 V)
FUNCTION OF TERMINALS
M1 N.1: audio signal GND
N.2: "hot" balanced audio signal (low level)
N.3: "cold" balanced audio signal (low level)
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