Hardware

Installation

The contents below specify the conditions required for the operation of ReXgen1.

GROUNDING

Since providing a common ground between nodes is not required, it is possible to have ground offsets between nodes. Each node may observe different single-ended bus voltages (common mode bus voltages) while maintaining the same differential voltage. Operating a CAN system with large ground offsets can increase electromagnetic emissions. If the system is sensitive to emissions, steps must be taken to eliminate ground offsets.

TERMINATION

ISO-11898 requires that the CAN bus have a nominal characteristic line impedance of 120Ω. Therefore, the typical terminating resistor value for each bus end is 120Ω. Bus termination is used to minimise signal reflection on the bus.

SUPPLY VOLTAGE

It is always recommended to keep the nominal voltage within the specified range. The device also has internal protection against low-energy voltage events due to supply wire noise.

ISOLATION

CAN Bus and USB are not isolated; care must be taken when plugging the USB into the device. Removing the power supply when the device is interfaced with a PC via a Micro USB cable is advised.

Notes:

• The CAN Bus Isolator and USB Isolators can be purchased separately.

• Please do not use the logger's USB port for data logging, as it may damage the port and will not be covered under warranty.

MOUNTING

Always mount the device in a way that minimises vibration exposure and accounts for its IP rating. ReXgen1 includes four screws to assist with the mounting process.