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Main Board (Relays Module) (Ref. 2579)
System allows up to four mainboards. Each mainboard manages up to five relay cards. Each Relay
Card handles 10 apartments.
Four lines of the mainboard bus (Dt, Ck, E, G) and the 12 -35Vdc(+,-) power supply reach each
mainboard from the Telephone Central Unit.
It also provides the selected line with two pairs of telephone lines (C1, C2, V1, V2).
The number of each mainboard (from 0 to 3) is indicated by means of the switches in each mainboard
as described in the following table:
Telephone System Relay Card (Ref. 2580)
Each relay card selects one of the 10 apartments which are connected to it. The place in which each
relay card is plugged determines which telephone line is handled.
Altogether, each Telephone Central Unit has the capability to handle 199 dwellings (4 mainboards x 5
relay cards x 10 apartments). Apartment number 0 is not used.
√ √ √ √ √
IMPORTANT NOTE:
On the first Relay Card, the Relay placed on position 0 is not used, so it mustn't be
wired when installation is done
Algorithm to determine correspondence between call from the outdoor panel and apartment consists
in:
- Dividing (with remainder) apartment number by 50.The integer part (from 0 to 3) indicates the
mainboard (module) number, first digit of the residue for relay card number (from 0 to 4) and
second digit for activated relay (from 0 to 9) which led must turn on.
A0
A1
ON
ON
ON
OFF
OFF
ON
OFF
OFF
0
0
CARD
CARD
CARD
1
1
#1
#2
#0
CN6
2
2
V1
3
3
V2
4
4
C1
5
5
C2
6
6
Placa Base
7
7
Mainboard
8
8
9
9
A0 A1
Dt
Ck
E
G
+
12 V
-
POWER
Placa
0
1
2
3
0
0
0
CARD
CARD
1
1
1
#4
#3
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
25
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