RFL 9780 RFL Electronics Inc.
April 8, 2003 2-19 (973) 334-3100
On the receive side, the Logic Module is fed information regarding the presence of guard or trip
frequencies, low carrier level, and signals from analog noise detector circuits. These signals are
processed to validate both the trip and guard inputs per the customer specified configuration.
The logic module is also responsible for various housekeeping and alarm functions. See Section 6 for
more information about the Logic Module.
2.9.4 SEQUENCE OF EVENTS
The Sequence Of Events (SOE) Module provides a computer interface to the RFL 9780. The module
monitors the system status at all times and records any changes in a log. There are two RS-232
connectors on the 9780 to access the SOE Module, one on the rear and one on the front of the unit. The
rear connector is intended for permanent connection to monitoring equipment (if available) while the
front connector is intended for short-term connection to a PC or terminal for system interrogation. The
front connector input overrides the rear connector.
The user may request the present status of the 9780 chassis on a one-time or continuous update basis.
Additionally, the module saves the forty most recent changes in status in a log with time and date
stamping. This data may be viewed (or downloaded) one record at a time or the complete log may be
dumped.
The SOE Module contains a Y2K compliant clock that is automatically synchronized to an IRIG-B
input signal if available. When a valid IRIG-B signal is not available, the clock continues to run in a
free-running mode. See Section 15 for more information about the SOE Module.
2.9.5 CHASSIS AND POWER SUPPLY
The 9780 chassis houses all of the modules and contains a full-system motherboard. The motherboard
distributes power to all of the modules and interconnects signals between modules. As a result, the
motherboard (and thus chassis) are specific for a particular configuration of 9780. The Tx/Rx chassis
differs from the Tx/Tx and Rx/Rx chassis.
Each chassis can be equipped with either one or two power supplies. Two supplies may be used to
provide a backup power source should one supply fail. Each supply contains monitoring circuits to
detect a failure of any of the supplied voltages. (Note that in a Tx/Tx chassis, two supplies are required
to provide the energy required for two 10 watt transmitters.) See Sections 19 and 20 for more
information about the Power Supplies and Chassis.
2.9.6 ALTERNATE CONFIGURATIONS
The previous discussion has dealt primarily with the Tx/Rx chassis. Alternate configurations are available
for the 9780: Tx only, Rx only, Tx/Tx, and Rx/Rx. In these cases, some of the information presented above
will not be applicable, and some may apply to more than one channel.
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