ROHS 6400AK Series User Manual page 36

4. Some problems in application
Star connection is always adopted by users in application. In this situation, the
terminal resistors should be on the 1# and 15# (as it is shown in picture 6) of two
devices with maximum line distance. However, this connection type is not
consistent with the operating requirements of RS 485 industrial standard, so the
problems, like signal reflex and the decrease of anti-jamming capability, easily
occur, which may reduce the reliability of controlled signal. The phenomenon
reflected is that balling machine is completely or discontinuously out of control, or
that it cannot stop running. To solve these problems, we propose to use MC 2080
Rs485 distributor, because this product can convert the star connection mode to
that one accord with RS 485 industrial standard, avoiding problems to improve the
reliability.
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Intelligent Dome Camera (6400AK Series) User Manual
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