CTI Products AIB AstroTAC Interface - Manual (Page 9)

AIB Hardware Reference Theory of Operation
CTI Products, Inc.
68-10842-115
4
2.4 System Example
Figure 2 shows an example comparator display system using the AIB module and
ASTRO-TAC™ Comparator.
CA-80040-100
COMPARATOR
ASTROTAC
AIB
OPERATOR
STATION
USER
INTERFACE
MODULE
MCN NETWORK
Figure 2 - AIB System Example
When the ASTRO-TAC™ Comparator detects that a receiver is active, it sends a
RECEIVE command followed by a VOTE command (if that receiver becomes
voted). The AIB processes these commands and sends them to the User Interface
Module. The User Interface Module then indicates that the receiver is active and
voted. If the User Interface Module is an IIB, the IIB activates the VOTE and RX
outputs for that receiver’s status display.
If the comparator detects that a receiver has failed, then it will send a FAIL
command to the AIB. Again, the AIB sends this FAIL command to the User
Interface Module so that the user can see that the receiver has failed.
One issue to note, however, is that if Motorola’s RSS (Radio Service Software) is
used to disable a receiver, the comparator does not send the DISABLE
information to the AIB. The MCN comparator display system will not show that
receiver as being disabled, even though it truly is disabled in the comparator.
From the operator station, the user can generate FORCE VOTE or DISABLE
commands for each receiver in the system. The User Interface Module detects
these commands and sends them to the AIB. The AIB then sends a command to
the ASTRO-TAC™ Comparator, telling it which receivers were force voted or
disabled.
In this example, if the User Interface Module is an IIB, the IIB has to be
configured for bank 0 to operate with receivers 1 through 8 of the ASTRO-TAC™
Comparator or configured for bank 1 to operate with receiver 9 through 13. If the
User Interface Module is a HIB with the MCN Remote Comparator Display
software running on a PC, only bank 0 (receivers 1 through 8) can be monitored
and controlled. Refer to the hardware reference manual of the User Interface
Module for details about bank configuration.