This guide provides instructions on the general installation for the Syrus 4 as well as some useful tips and considerations.
Syrus can be installed for various applications under many environments, the most common being inside a vehicle as long as the following environmental conditions are met:
- No direct exposure to sun light.
- Away from excessive heat sources like the motor or the exhaust's path.
- Away from excessive cold sources like a truck's refrigerator or AC system.
- Not attached to a highly vibrating structure.
The unit's location can be such that it remains hidden. The LED indicators do not have to be visible but it is recommended to have some access to them for failure/diagnostics situations.
# Power Supply
The unit's power cables should be directly connected to the vehicle's battery (12V or 24V). The unit supports an operating voltage range from 8V to 38V.
When the unit is not being used in a vehicle (e.g. lab testing) it must be powered by a 12V DC adapter that supplies a minimum current of 800mA.
Warning: The internal lithium polymer battery has an integrated automatic cut off circuit to protect against over-charge, over-current and over-discharge. After long disconnection periods, the battery may activate its over discharge protection circuit.
The unit is shipped with an unplugged battery connector to help prevent this state. Plug this connector in before connecting the main power and wait for activity indication on the green LED. It is not recommended to unplug the battery, except for seldom long storage periods.
Even though it is possible for the unit to work with no internal battery, it is recommended to always use the battery, this is to prevent any data loss or memory corruption that can be caused due to momentary external power loss.
# Main Power Switch
When the vehicle has a main power switch to cut/restore the battery voltage, some recommendations have to be followed:
If the switch disconnects the positive voltage of the vehicle's battery, the Syrus can be connected before or after the switch. When connected before it will keep on receiving the vehicle's power whenever the switch is off. If it is connected after the switch, the unit will run with its optional back up battery whenever the switch is turned off.
See the following figures for a better understanding of connecting the unit when the vehicle uses a main power switch:
Power switch at positive and Syrus connected after
Power switch at positive and Syrus connected before
Power switch at negative and Syrus connected after
# Ignition Detection
The electrical conditions for the ignition input are:
|Ignition ON||6.1V to 30V|
|Ignition OFF||0V to 4.6V or Open|
This input is designed to be connected to the ignition's key position that closes the circuit between the battery's positive voltage and the vehicle's electrical system. It should not be connected to the start position which gives energy to the vehicle's start engine as this position is ON only for a short period of time. The unit's ignition sense can be directly connected to the electrical end of this position.
The inputs are connected internally to several protection circuits, including over voltage protection among others. See the Connection Diagrams for an example of this connection.
# Connection Diagrams
Panic & Ignition Detection
One of the most distinguishing factors of the Syrus device is it's ability to interact with many accessories at once. That said it is important to consider the amount of power drawn from all accessories you connect before proceeding to install it on a vehicle. To help with the power consumption you can use the Power Saving Mode to make sure when the device's power is OFF for example then it goes into low power consumption mode. You should also consider cutting the power to accessories when the vehicle's Ignition is OFF for example.
# Acceleration Detection
Although it's recommended to install the unit upright, the device can be installed in any direction as long as you follow the procedure to self align the device. Self alignment and calibration of the accelerometer allows you to obtain accurate measurements for driving behavior events such as harsh acceleration, braking, cornering, etc.