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The third form is the output relay and to transmit
a 15-character description of the alarm over-the-air to
a remote location. The description is sent in Morse
code with a transmit ID assigned during programming.
A transceiver programmed with this ID can monitor
the repeater and alert the system owner when an alarm
occurs.
6.13.4 ALARM FUNCTIONS
The alarms can be configured in various modes to
alert the system owner to conditions and hazards with
the equipment and the repeater site facility. A few of
the possibilities are shown in Figure 6-19. In this
example the input alarm 2 of Repeater 1 is connected
to the door of the building, input alarm 3 of Repeater 5
is connected to the fire alarm system, the AC fail
alarm (#16 see Table 1-2) is mapped to alarm 2 output
so it can be transmitted (see Figure 4-10) and the out-
put alarm 1 of Repeater 1 is connected to the input
alarm 1 of Repeater 2 and so on until the output alarm
1 is fed back to the input alarm 1 of Repeater 1. Then
the RF Shutdown alarm (#32) is mapped for alarm 1 in
each repeater. This configuration allows Repeater 2 to
give an alarm when Repeater 1 has an RF Shutdown
alarm output, etc.
The input alarms are given a 15-character
description during programming and a Transmit ID.
These are used when an input alarm is activated to
send a Morse code message consisting of the descrip-
tion over the air to a monitoring transceiver pro-
grammed with this ID.
There are 40 internal alarms that can be included
in the output alarm configuration (see Table 1-2).
These alarms can also be programmed to send an out-
put as shown in the cross reference screen of the alarm
configuration menu (see Figure 4-10). Among these
alarms are the thermal sense from the PA and the AC
fail alarm output on the terminal block at the rear of
the repeater to activate the battery backup.
6.13.5 P500 SIGNALING CONNECTOR
The input and output connectors for the IAC are
defined as follows. The signal interface connector
P500 (64 pin) connects the Address and Data buses
and control lines to the backplane connector. See Fig-
ure 6-23.
Pins 1-4
ADDRESS BUS (A12-A19 Only)
Pins 33-36
This address bus provides a path between the
MPC main processor and the latches and multiplexers
of the IAC. This bus retrieves information pro-
grammed into the MPC memory for the operation of
the IAC.
Pins 5/37
ALARM 1 IN +/ALARM 1 IN -
This is an input received from a connection to an
external device as a specific alert condition.
Pins 6/38
ALARM 2 IN +/ALARM 2 IN -
This is an input received from a connection to an
external device as a specific alert condition.
Pins 7/39
ALARM 3 IN +/ALARM 3 IN -
This is an input received from a connection to an
external device as a specific condition.
Pins 8/40
ALARM 4 IN +/ALARM 4 IN -
This is an input received from a connection to an
external device as a specific alert condition.
Pin 9
SQUELCH ENABLE
This is an output to rear connector J1. It can be
configured for inverted output, non-inverted output or
logic controlled non-inverted output.
Pin 10
EXTERNAL REQ 2
This is an input received from a connection to an
external device.
Pins 11-14
DATA BUS
Pins 43-46
This data bus provides a means of transferring
data to and from the latches and multiplexers on the
IAC with peripheral devices in the IAC.
Pin 15
MREQ
A memory request line operates in conjunction
with the Read/Write lines. These lines read from or
write to the MPC processor memory.
6-45
CIRCUIT DESCRIPTION
October 1999
Part No. 001-2009-201
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