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Resistor jumper setting
RS-485 bus needs two 120
Ω
_ resistors at both
ends. Set on the 120
Ω
¸resistors of the two
devices (keyboard or dome) in the farthest
distant on RS-485 bus. Default setting is OFF.
When choosing the first and second pins in JP2,
the 120
Ω
¸termination resistor is connected.
When choosing the second and third pins in
JP2, the termination resistor is unconnected.
2 3
1 2
O N
O F F
Alarm output method setting
There are two alarm output methods: NO and
NC. NO means normal state is open circuit, the
circuit will be closed when an alarm comes in.
NC means the contrary.
When choosing the first and second pins in JP4 and
JP5, the alarm output state is NO. When choosing
the second and third pins in JP4 and JP5, the alarm
output state is NC. Factory default is NO. (Refer to
following picture)
1 2
2 3
N O
N C