NEXCOM NViS 3620 - Manual (Page 81)

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Appendix D: Signal Connection of MCU DI/DO
NViS3620/3720 series User Manual
Pre-Alarm Function by Event Button,
MCU-DI and MCU-DO
Pre-Alarm function allows NViS3620/3720 series to monitor the environment
and make reaction, even when NViS3620/3720 series is turned off.
By monitoring the environment with sensors connected to Event Button
and MCU-DI ports, NViS3620/3720 series can react to certain situations.
For example, events triggered by external sensors, such as temperature
change, instrusion or vibration, NViS3620/3720 series can react accordingly
by turning on the siren or warning light, and power on automatically for
further action against the event.
Setting up Pre-Alarm function
MCU-DI1 is used to initiate Pre-Alarm function, which is usually connected
to the vehicle’s Central Locking System. As such, the Pre-Alarm function
on NViS3620/3720 series will be initiated or released based on the locking
and unlocking state of the Central Locking System. For instance, when the
Central Locking System is initiated or released, the Pre-Alarm function on
NViS3620/3720 series will be initiated or released, respectively.
Step 1: Enable/Disable Pre-Alarm function in BIOS
Select “Enable” or “Disable”to initiate or terminate Pre-Alarm function.
Step 2: Select the trigger threshold level in BIOS
For vehicles with electric central door lock, check the corresponding trigger
type (negative or positive), then connect MCU-DI1 to Central Locking
System in vehicle.
Negative level: < 3.3V
Positive level: > 3.3V
If the Central Locking System is initiated (locking signal is received) by a
negative signal, select “Low” in the trigger threshold level. Once the Central
Locking System is released by a positive signal, the Pre-Alarm function on
NViS3620/3720 series will be released.
If Central Locking System is initiated (locking signal is received) by a
positive signal, select “High” in the trigger threshold level. Once Central
Locking System is released by a negative signal, the Pre-Alarm function on
NViS3620/3720 series will be released.
MCU-DI1 & MCU-DI2 (source type): 3~12VDC
MCU-DO1 & MCU-DO2 (source type): 3~24VDC