The loudspeaker as same as microphone are connected by wires as
you can see on picture 1. Caution on polarity of microphone because is
powered
(+ -)
.
Version A
contain three connectors for connect microphone a three
conectors for connect speaker. Microphones is possible conect to the
conectors
MIC1..MIC3
it is paralel inputs with same features. Conectors for
speakers has diferent features, left connector SPK is output from HandsFree
and powered from line (only one for
Version B
), connectors SPK1..SPK2 is
output from 1W amplifier powered from 12-24V connection (only
version A
).
The jumper marked
SERVICE
is available for automatic enter to
programming mode when password is forgotten. When jumper is ON And you
make incoming call on NLLW then after picking up you are directly in
programming mode. In programming mode you can change all parametres
includes new password as well.
Connection of
Button
(emergency call) and connection of
Input
(Error
or Technical call) is wiring as current loop and by jumper is possible choice
from the current loop is powered. Attention - button is galvanic connect with
source power of current loop and isolated from line by optocoupler. In case
powered current loop from telephone line is button galvanic connect with
telephone line.
Two jumpers behind connector for connection LEDs determine if they
will be connection indication LEDs (jumers they are open) or indication bulbs or
LEDs with resistor (jumers they are short). These jumpers just short serial
resistors. At using power supply 12V is current LED c. 10mA, at short-circuited
jumpers be allowed max. current 0,5A
.
The black connector on oposite side from screw terminal is designed
for PC connection by special cabel KAB. The cabel is galvanicaly isolated
convertor of RS 232 interface (PC port
COM1, COM2…) and NLLW interface.
Galvanical isolation is neccessary because PC might be grounded and
telephone line MUST NOT be grounded! When your PC is not equiped by RS
232 port but only USB then you can use convertor USB-RS232 for its is in your
PC creates virtual seriál port (for example COM6) and this you will select in
configuration software LiftSet for communication to NLLW. Is posible too use
USB cable
- we recommended.