Appeal 2007-1535
Application 10/626,969
addressed using the same wiring for all devices.7 In any event, the very
labels used by Nykerk to identify the data bus 64 and wiring harness 30
respectively further suggest that they are distinct in structure and operation.
Boreham, however, is a closer question. Boreham discloses a siren
unit 2 with a CPU 4 that provides signals that activate an audible siren
responsive to trigger signals received on control input 10 via serial interface
12. The control input 10 is connected to a vehicle security control unit that
is able to (1) monitor the vehicle, (2) determine when an alarm condition
occurs, and (3) issue the appropriate trigger signal (Boreham, col. 2, ll. 41-
53; Fig. 1).
Depending on the siren unit’s configuration, the siren unit is triggered
in either of two ways: (1) the contents of a control data packet received by
the serial interface 12, or (2) a trigger signal on the control input 10
(Boreham, col. 4, ll. 28-31). If serial interface control is enabled, the CPU
must regularly receive (e.g., every second) a 24-bit control packet 54 from
the vehicle security control unit to prevent the siren from being activated
(Boreham, col. 4, l. 55 - col. 5, l. 12).
The details of this 24-bit control packet are provided in the table in
column 5 and Figure 6. Significantly, a four-bit address field is provided
(Bits 0-3) which enables the vehicle security control unit to address devices
other than the siren unit 2 on a single serial data bus (Boreham, col. 5, ll. 15-
60; col. 6, ll. 20-23; Fig. 6).
7 See Appeal No. 2002-1784 (BPAI 2002) (non-precedential), at 6 (“[A] bus
is a communications link that uses one set of wires to connect multiple
subsystems.”).
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