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FIGURE 4.2
4.2.4. QUESTION IN APPLICATIONS
In the actual construction, user often adopts y-junction connection
mode whose terminal impedance are connected with the furthest
two equipments (as B and D in figure 4.3). But it doesn't comply
with the use requirement of RS485 industrial standard, so it would
lower the reliability of control signal by causing the problems such
as signal reflection and a weaker antiinterference ability in the
situation that there is long distance among every equipment. Its
reflecting phenomenon is that speed dome isn't under the control
completely or under control off and on or can't stop from automat-
ically running. We advise to use RS485 allotter which can avoid
problems and increase the communication reliability in the situa-
tion mentioned above by change y-junction mode to the connection
mode complying with RS485 industrial standard.
FIGURE 4.3
4-4
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