ZETRON 025-9581M, Installation And Maintenance Manual

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Connector Details
The PA AUD relay (pins 9 through 12) is used to select the source of the PA system audio
input. The common contacts from this relay should be connected to the PA system audio
input. The normally open inputs, to this relay, are internally connected to the Model 6203
PA output. The normally closed inputs, to this relay, can be connected to a second audio
source, such as a microphone. This second audio source would then have control of the PA
during the times that the Model 6203 is not using the PA.
The pin connections for the J3 connector are listed in Table 4 .
A diagram showing the pinouts for the PA relays is shown in Figure 50 .
Table 4: Transponder Board Connector J3 Pinout
Pin Description
Pin 1
(PA BUSY) This connection is used if there are two Station Transponder Units (a pri-
mary and a secondary) at the same station.
This pin should be connected
between the two units. Its purpose is to prevent both units from sending
tones to the PA at the same time. This pin is driven low by a Model 6203
while it is toning, and it must be high before the Station Transponder
Unit can start toning.
Pin 2
(GND) This pin is connected to the Model 6203 chassis ground.
Pin 3
(PA PTT COM B) This pin is connected to the PA PTT relay common “B” contacts. It
would typically be connected to the PA amplifier PTT input.
Pin 4
(PA PTT NC B) This pin is connected to the PA PTT relay normally closed “B” contacts.
It is connected to the common “B” contacts when the PA LED is off.
Pin 5
(PA PTT NO B) This pin is connected to the PA PTT relay normally open “B” contacts. It
is connected to the common “B” contacts when the PA LED is on.
Pin 6
(PA PTT COM A) This pin is connected to the PA PTT relay common “A” contact. It would
typically be connected to the PA amplifier's PTT input.
Pin 7
(PA PTT NC A) This pin is connected to the PA PTT relay normally closed “A” contact.
It is connected to the common “A” contact when the PA LED is off.
Pin 8
(PA PTT NO A) This pin is connected to the PA PTT relay normally open “A” contact. It
is connected to the common “A” contact when the PA LED is on.
Pin 9
(PA AUD COM B) This pin is connected to the PA AUD relay common “B” contacts. It
would typically be connected to the PA amplifier audio input (+ side).
Pin 10
(PA AUD NC B) This pin is connected to the PA AUD relay normally closed “B” con-
tacts. It is connected to the common “B” contacts when the PA LED is
off. It is typically connected to a second PA audio source.
Pin 11
(PA AUD COM A) This pin is connected to the PA AUD relay common “A” contacts. It
would typically be connected to the PA amplifier audio input (- side or
GND).
Pin 12
(PA AUD NC A) This pin is connected to the PA AUD relay normally closed “A” con-
tacts. It is connected to the common “A” contact when the PA LED is
off. It is typically connected to a second PA audio source.