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WARNING
• Install the equipment by carefully following the instructions given by the manufacturer and in compliance with the legislation in force.
• All the equipment must only be used for the purpose it was designed for. Comelit Group S.p.A. does not assume responsibility for improper use of the appliances, for
modifications made by others for any reason or purpose, or for non-original accessories and materials.
• All products comply with the requirements of the 2006/95/CE directives (which replace the 73/23/CEE directives and subsequent amendments), as certified by the CE mark on
the products.
• Do not route the riser wires in proximity to power supply cables (230/400V).
TV INTERFACE ART. 1257
Art. 1257 serves to distribute the BUS line video signal from the external units or
remote cameras, to remote monitors, televisions or external DVRs. The device can be
used on systems with Simplebus 1, Simplebus 2 or Simplebus Color wiring. For
connection distances between branch terminal Art. 1214KC and TV interface Art. 1257
refer to Table 1. For all other distances, refer to MT/SBC/01, MT/SB2/01, FT/SBC/04
and FT/SB2/15.
Fig. 1
PARTS DESCRIPTION
1 Terminal block for system connection:
~+, ~- power supply input terminals (for Simplebus 1 systems only).
L L BUS line input.
OUT GND 12V open collector output (max 30mA). Can be used for operating relays,
triggering DVRs or as a "Function Switching" signal (switching input of the televisions ).
V SH standard composite video signal
2 IND 1 IND 2 DIP switch for setting user code
3 JP1 JP2 jumper for selecting Black/White or Colour mode.
4 JP4 jumper for selecting Permanent or Timed mode of the
OUT signal.
5 JP3 jumper for selecting Simplebus 1, Simplebus 2 or Simplebus Color mode.
6 CV5 video closure jumper.
Type of cable
Comelit cable Art. 4577 sect. 1 mm2 (Ø 1.2 mm AWG 17)
UTP5 cable cat 5 sect. 0.2 mm2 (Ø 0.5 mm AWG 24)
Twisted pair telephone cable sect. 0.28 mm2
(Ø 0.6 mm AWG 23)
Double-wire cable sect. 0.5 mm2 (Ø 0.8 mm AWG 20)
Double-wire cable sect. 1 mm2 (Ø 1.2 mm AWG 17)
Braided and shielded cable sect. 1 mm2
(Ø 1.2 mm AWG 17)
Double-wire cable sect. 1.5 mm2 (Ø 1.4 mm AWG 15)
Table 1
MAX distance between branch terminal Art. 1214KC
and Art. 1257
60 m
(195 feet)
40 m
(130 feet)
40 m
(130 feet)
40 m
(130 feet)
40 m
(130 feet)
30 m
(100 feet)
40 m
(130 feet)
OPERATION
The module is capable of operating in 4 different modes depending on the type of
system:
• Single Address mode (diagram SB2V/020G)
In this mode, at least one coded external unit must be present, with the same address
as set on the module. Art. 1257 will activate only after a call is made to that address. If
connected to the run after mixer Art. 4888 or Art. 4888C, Art. 1257 must be
combined with an internal video unit.
To programme this function, set the desired address on DIP switch IND 1 and leave
IND 2 at zero (Example setting code 7) (Fig. 2).
Fig. 2
• Independent Mode (diagram SB2/ABH)
Use this mode only if Art. 1257 is installed on a run of the system before mixer
Art. 4888, Art. 4888C.
In this mode, the module must have a unique address (not used for other internal
units). Art. 1257 will activate only after a call is made to that address.
To programme this function, set IND 1 to "11111111" and set the desired address on
IND 2 (Example setting code 3) (Fig. 3).
Fig. 3
• Address range mode (diagram SB2V/021G)
In this mode, at least one internal unit must be present for each address included in the
range set on the module. Art. 1257 will activate only after a call is made to these
addresses. If connected to the run after mixer Art. 4888, Art. 4888C, Art. 1257 must
be combined with internal video units.
To programme this function, set the minimum address in the range on DIP switch IND 1
and the maximum address in the range on IND 2 (Example setting MIN code 1 and
MAX code 239) (Fig. 4).
Fig. 4
• Two Single Address mode
In this mode, for each of the two different addresses set on the module, at least one
internal unit must be present. Art. 1257 will activate only after a call is made to these
addresses. If connected to the run after mixer Art. 4888, Art. 4888C, Art. 1257 must
be combined with internal video units.
To programme this function, set the higher address on DIP switch IND1 and the lower
address on IND2 (Example setting code 19 and code 3) (Fig. 5).
Fig. 5
FT SB2 20
3
FT SB2 20
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