Clean Transparent Cover; Using An Rs-485 Bus - Comelit SPTZ10IR Mode D'emploi

Fig 25

Clean Transparent Cover

In order to assure a clear image of dome, the clear dome should be cleaned regularly.
● Be careful when cleaning and hold the outer ring to avoid directly touching the dome.
● Please use a soft dry cloth or other alternatives to wipe internal and external surfaces.
● If dirt is heavy, a mild detergent may be used.

Using an RS-485 Bus

1. Basic Feature of RS-485bus
According to the industry bus standard, The RS-485 bus is half-duplex communication bus with
a typical impedance of 120Ω, whose maximum load capacity is 32 payloads (including the
master device and the controlled device).
2. Mode of Connection and Terminal Resistance
2.1 The RS485 bus requires that parallel connections should be used between the devices
with 120Ω terminal resistances connected at the both ends.
Fig 26 Fig 27
2.2 120Ω terminal resistance is connected as shown in fig 27.
120Ω terminal resistance is available in the circuit board and the connection is shown as
following:
When needing to connect 120Ω resistance, toggle the 8
th
bit of DIP switch SW2 to "ON" . This
will connect the 120Ω resistance to the circuit.
20