Product manual
Installation
30 025-9158L
Pin Description
8
(PA READY)
This signal is used to signal a dispatch console when it is time for the
dispatcher to talk through the remote station’s PAs. This is an open collector
output. Its active state polarity is set in the Software Configuration Program by
the “PA Ready Active Polarity” parameter (see
System Configuration Menu on
page
33). It is typically connected to the XBUSY or BUSY MUTE input on a
dispatch console to mute unwanted noise. This signal and the DATA MUTE
signal perform similar functions but in different ways. This signal is normally
inactive while remote station PAs are off. Whenever remote station PAs have
been turned on and are ready for dispatch announcements, this signal goes
active for the duration of the PA on time (see
Alert with PA Commands on page
95).
9 and 10
(GND)
These two ground pins should be connected in parallel to the ground on the DC
power source that is supplying the Model 26.
11 and 12
(12 Vdc)
These two pins should be connected in parallel to a +12 Vdc power source
capable of supplying at least 3.5 amps.
HANDSET Connector
This port provides an interface into the transmit and receive audio channels of the Model
26. Typically a Zetron handset is connected here. The pin descriptions for this connector
are as follows:
Pin Description
1
(PTT)
This is the handset Push-to-Talk input. It must be grounded (typically with pin
6) before audio can be routed from the handset microphone to the Model 26
transmit circuits.
2
(MIC)
This is the handset microphone input (typically mated with pin 5, GND). When
the handset PTT input is grounded and remote PAs have been turned on and
acknowledged by the Model 6s then audio from this input is transmitted to the
PAs through the Model 6s. Audio from this input can also be transmitted to the
earphone of a Model 6 handset during Model 6 Talk-Back mode. The input
level of this pin is adjusted by potentiometer “MIC XMIT” (R30).
3
(EAR)
This is the handset speaker output (typically mated with pin 4(GND)). It carries
the echo of transmitted audio from pin 2 and audio from a Model 6 during
Talk-Back mode. The output level from this pin is adjusted by potentiometer
“EAR RCV & SIDETONE” (R68).
4, 5, and 6
(GND)
These 3 pins are connect to chassis ground of the Model 26.