11
Figure 3-2 Connecting method with RS-485 distributors
3.3 FAQ on RS-485 Cable
Malfunction
Possible Reason
Solution
The Device can perform
self-check, but is out of
control.
Baud rate/address of the
host and Device are not
matched.
Modify the baud
rate/address of the host or
Device to be matched.
Positive electrode and
negative electrode of RS-
485 cable are
misconnected.
Connect cables to the
positive electrode and
negative electrode correctly.
Loose connection.
Connect the cables firmly.
RS-485 cable is broken.
Replace RS-485 cable.
The Device can be
controlled, but the operation
is not smooth.
RS-485 cable is in poor
contact.
Connect the RS-485 cable
firmly.
RS-485 cable is broken.
Replace RS-485 cable.
The distance between the
host and the Device is too
long.
Install terminal resistance.
Too many cameras are
connected parallelly.
Install RS-485 distributors.
