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Alarm output method setting
Resistor jumper setting
There are two alarm output methods: NO and NC.NO
RS485 bus needs two 120 ohm resistors at both ends.
means mormal state is open circuit, the circuit will be
Set on the 120 ohm resistors of the two devices (keyboard
closed when an alarm comes in. NC means the contrary.
or dome) in the farthest distant on RS485 bus. Defualt
When choosing the first and second pins in JP12 and
setting is OFF. Refer to page 51 for more RS485 detail.
JP14,the alarm output state is NO. When choosing the
second and third pins in JP12 and JP 14, the alarm out-
When connecting the first and second pins in JP1, the
put state is NC. Factory default is NO.(refer to follow-
120 ohms termination resistor is connected. When con-
ing picture)
necting the second and third pins in JP1, the termination
resistor is unconnected.
PCB
2 1
3 2 1 3
PCB
1 2
NO
2 3
NC
3 2 1
1 2
ON
-49-
2 3
OFF