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USB SINGLE-PORT HUB (RS-422/485)
common ground connection. Differential interfaces are
typically more immune to noise or voltage spikes that
may occur on the communication lines. Differential
interfaces also have greater drive capabilities that allow
for longer cable lengths. RS-422 is rated up to 10 Mbps
and can have cabling 4000 feet long. RS-422 also defines
driver and receiver electrical characteristics that will
allow one driver and up to 32 receivers on the line at a
once. RS-422 signal levels range from 0 to +5 volts.
RS-422 does not define a physical connector.
RS-485
RS-485 is backwardly compatible with RS-422; however, it
is optimized for partyline or multi-drop applications.
The output of the RS-422/485 driver is capable of being
Active (enabled) or Tri-State (disabled). This capability
allows multiple ports to be connected to a multi-drop
bus and selectively polled. RS-485 allows cable lengths
up to 4000 ft. and data rates up to 10 Mbps. The signal
levels for RS-485 are the same as those defined by
RS-422. RS-485 has electrical characteristics that allow
for 32 drivers and 32 receivers to be connected to one
line. This interface is ideal for multi-drop or network
environments. RS-485 tri-state driver (not dual-state) will