4
DS1145-019A
Examples of frame configuration
1.3 MODULES
CHARACTERISTICS
1.3.1 Basic
Module
The basic module is supplied in two versions, with two buttons (1145/2) and with one button (1145/1).
Fig. 1 Basic module rear view diagram
To ensure the functioning, the device must be connected to a PABX extension line through the terminal
marked by “a b LINE” up to a max. distance of 300m. The device circuits interface with the telephone line,
and anything else isn't required for the communication. If an external power supply is necessary (for
example if relays are used), this voltage must be: from 10 Vac. min. to15 Vac max., or a voltage from 12
Vdc min. to 18 Vdc max, and it must be connected to “12 V” terminal. The load of this power source
depends on the modules number, because it supplies also the buttons backlighting. With the maximum
number of modules connected, the input current doesn't exceed 300mA. This source can also be used to
supply one or more electric locks; in this case also the electric lock consumption must be considered. The
12V/1A (9000/230) AC output power supply is enough for these requirements. For relays connection see
figure 1. The relays are galvanically insulated from themselves and from the other circuits (NO = normally
open, NC normally closed). The different connection modes are shown in figure 2. The "
G
" 2.8mm faston is
necessary for ground connection. The “
SPK
” trimmer is used to adjust the speaker volume and it doesn't
affect the other device characteristics. The “
MIC
” trimmer adjusts the microphone volume. This adjustment
can improve the conversation, for example in case of background noise in the streeet. The "
HEAT
" jumper
is used to enable the heating board (necessary in cold and damp environments). This last function requires
the 12V power supply connection on the terminal marked by “12V”. The "
SERVICE
" jumper is used to
access directly programming. It can be used, for example when there isn't any programming password.
Speaker volume
adjustment
Microphone
volume adjustment
Expander
TRH
Level configuration for
microphone activation
Grounding
Flat cable connection for
extension up to 64 buttons or
keyboard
To 1145/4
Programming jumper (in short
circuit – without password)
Jumper – in short circuit –-
board heating active
telephone line connector
12V ac/dc Power supply
For the two relays, lighting and
heating
Relay 2
Relay 1
