Appeal No. 1997-3743
Application 08/419,166
where the binary value depends on the direction of the voltage
difference between the two conductors.
In figures 1 and 2 of Mathews, the UART 28 is a serial
communication device connecting the program terminal 11 to the
primary rack 12 and specifically to the first communication
processor 21 in a serial mode. Similarly, the first network
interface 29 in Figure 2 connects the local area network 17 to
this first communication processor 21 in a serial mode. The same
may be said of the second network interface 76 to interconnect
the various input/output racks 14 on bus 15. Each of these
devices clearly converts external serial information on buses 13,
15 and 17 to internally busable parallel information for the
various internal parallel buses and vice-versa for transmission
on the various busses noted. These features are generally
discussed at column 3, lines 29 through 41; column 4, lines 10
through 30; and column 6, lines 13 through 16. At least with
respect to the UART 28, there is an explicit statement in Mathews
that several commercially available devices may comprise this
unit, and such is similarly implied for the first network
interface 29 and the second network interface 76 since these
devices have no additional explicit teaching of their details in
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