Procom 4NPA - Manual (Page 2)

Data Sheet
4NPA
LF Interface Module
The DVS-21 is capable of connecting not just our own but also third-party de-
vices. A low frequency connection and control through C and V points makes
possible the use of the module 4NPA for four devices.
In order to meet other control requirements the 24LI line module can also be
used.
Application examples for intercom and public address systems with 4NPA
The 4NPA can be used for various applications.
With PA applications, for public address through a line-controlled call station, in
addition to the 4NPA module also the line card 24LI and the amplifier V100 are
required. The same applies for use with a signalling system (PABX) or radio
modules.
For intercom functionality at least one further call station is necessary. This can
be another third-party call station on the same or a second 4NPA module or a
ProCom call station on a 4NSA module.
In standard use, a gate intercom is realized with ProCom call stations and the
4NSA module.
As alternative the gate intercom function can be realized with the 4NPA mod-
ule and a third-party call station as gate call station. For this a ProCom call sta-
tion connected over the 4NSA module and a line card 24LI are required. Here it
must be taken into account that the third-party gate call station must have control
points (-V and C points) to switch the microphone and the call station amplifier.
Further areas of application are LF control of external amplifiers as well as the LF
connection of external sources (e.g. CD player).
CPU1 4NSA SV01
24LI
4NPA
WPS-04
WPS-08 AWC-06
DTA-012 030/ 048/ 066/ 084/ 114
Radio
2TW * Radio
Modules LF a / b
Third-party
Call Station
PABX
Radio
LF a / b
Carrier
Monitor-
ing / Tone
ringing
2TW *
Application Description:
PA /
Intercom
Control / ACK
DVS-21 LS 1
LC
V100
LS 2
LS n
* TW: Twin Wire
Date: 13.03.2009 1 Page: 2/5 Author: HS Document-No.: DB_4NPA_2320_01
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