Dataforth SCM9B-D192 Series Manuel de l'utilisateur - Page 3
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3 SCM9B-D192 USERS MANUAL
GENERAL DESCRIPTION
The RS-485 communications standard is recommended when many
modules, or other addressable devices, must be connected to a host
computer over long distances. The SCM9B-D192 repeaters allow
communications bus lengths up to 4,000 feet and baud rates up to
115K baud using one twisted pair of wires. The SCM9B-D192 is an RS-
485 repeater. Repeaters are required to extend communications bus
lengths or allow more than 32 RS-485 devices to be connected to a
communications bus. A repeater simply re-amplifies, or boosts, existing
RS-485 signals transmitted over long distances.
The SCM9B-D192 is isolated between input and output ports and
requires a regulated +5Vdc power supply.