Telex C-2002 - Manual (Page 13)

Remote Control Console
7
4.2.2 Supervisor Function
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
C onsole 1 : C onsole 2 : C onsole 3 :
L ine +
L ine -
L ine 1 L ine 1 L ine 1
Figure 6 Supervisor Function Example.
The Supervisor Function enables a console, such as the C-2002, which has the capability to drive this line, to
disable all units on a particular line. This includes both PTT and RX audio. Its connection is similar to that of the
crossmute function. By wiring alone, it is possible to setup only specific consoles with this feature. Figure 6 shows
the connection scheme required to utilize this function. Pin 2 of all consoles are connected together. In addition,
Pin 8 is also connected together on all consoles, serving as a common ground for all consoles. Assuming that
console 1 has supervisory capability, when activated, Line 1 on parallel consoles 2 and 3 would then be inhibited
from both Transmit and Receive.
4.2.3 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 closure can carry 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.
4.2.4 Two-Wire/Four-Wire Mode
The C-2002 comes standard with a jumper selectable two or four-wire option. Note: The C-2002 is shipped in the
four-wire mode. Two-wire mode is accomplished by the following jumper positions:
Two-Wire:
Jumper Position Jumper Position
Line 1 JP18 A Line 2 JP22 A
Line 1 JP19 A Line 2 JP23 A
Four-Wire:
Jumper Position Jumper Position
Line 1 JP18 B Line 2 JP22 B
Line 1 JP19 B Line 2 JP23 B
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.
4.2.5 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
console is on the line (no parallel consoles) then place J17 (Line 1) or J25 (Line 2) in the A position for a 600 Ohm
line impedance. If more than one console is on one line, then place J17 (Line 1) or J25 (Line 2) on ONE console in
the A position and all other consoles in the B position. Each console added to the system will result 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. As the chart indicates on the following page , the more consoles bridged on the line, the
lower the line impedance and the greater the loss in audio level. In 2 Wire mode, all consoles should have J17
(Line 1) or J25 (Line 2) in the “B” position.