C-2000 and C-2000HS Technical Manual
Installation 13
Bosch Security Systems, Inc.
Technical Manual
F.01U.174.927 Rev 03
Relay Contact Closure For Local Control
The relay is normally open and provides a dry contact closure during PTT functions between pins 7 and 8 of the line jack. The
relay contacts are rated at 500mA at 12VDC or 250mA at 115VAC. When using the intercom function, the relay is not
activated. If this
Relay Closure
is used for local control (or any other case where tone bursts are not used for signaling),
disabling the tone generation is recommended by entering the setup mode.
2-Wire/4-Wire Mode
The C-2000 comes standard with a jumper selectable 2- or 4-wire option.
NOTE:
The C-2000 is shipped in the 4-wire mode.
The
2-Wire Mode
is setup by the following jumper positions:
The
4-Wire Mode
is setup by the following jumper positions:
The RX pair is now on pins 3 and 6 on the connector and the TX pair is on pins 4 and 5. Once the transmit and receive paths
are separated the impedance of each side must be set.
RX Side Settings
In 4-wire mode, the
RX Side
is jumper selectable for a 600 Ohm impedance, or 10k Ohm impedance. If only one (1) console
is on the line (no parallel consoles), then place J8 in the A position for a 600 Ohm line impedance. If more than one (1) console
is on one (1) line, then place J8 on one (1) console in the A position and all other consoles in the B position. Each console
added to the system results in line loss.
The following chart gives an indication as to how much loss can be expected. The first console in the system is set for an
impedance of 600 Ohms out (approximately). Each console added to the system thereafter is set for an impedance of
10k Ohms. The more consoles bridged on the line, the lower the line impedance and the greater the loss in audio level.
NOTE:
In 2-wire mode, all consoles should have J8 in the B position.
Level adjustment can be made to the receive audio by entering the setup mode or adjusting the RX level poteniometer inside
the C-2000.
TABLE 1.
2-Wire Mode Jumper Settings
Jumper
Position
JP10
A
JP11
A
TABLE 2.
4-Wire Mode Jumper Settings
Jumper
Position
JP10
B
JP11
B
Console #
J8 Position
Impedance
Impedance
Loss (dB)
1
A
604
604
0.0
2
B
10k
569
-0.5
3
B
10k
539
-1.0
4
B
10k
511
-1.5
5
B
10k 486
-1.9
6
B
10k
464
-2.3
