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2–3
The physical link layer is a set of cables and interface modules that work
together to provide a channel for communication between the various
points, called
nodes
, on the physical link.
A Data Highway Plus node consists of an interface to Data Highway Plus,
usually a module. (The PLC-5 processor has a Data Highway Plus
connection built in, so it does not need a separate interface module.)
The Data Highway Plus cables consist of a trunkline that can be up to
10,000 feet long and droplines that can be up to 100 feet each.
You can use your Data Highway Plus to connect such nodes as:
RS-232-C devices attached to a 1785-KE or a 1770-KF2
Data Highway modules attached (via their RS-232-C port) to a 1785-KE
or a 1770-KF2
a PLC-3 or PLC-3/10 attached to a 1775-S5,-SR5
a PLC-2 family device attached to a 1785-KA3
PLC-5s (direct connection)
a T50 industrial terminal
a 1785-KA (connected to a Data Highway network)
Figure
2.2
illustrates a typical Data Highway Plus network.
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