CAN bus is the standard for most data loggers. It uses a pair of differential wires and can work over long distances. Yellowcog’s Pilot devices work with all common CAN bus modes (up to 1MHz). The bus must be terminated at both ends with 120 ohm resistors to ensure correct operation. Note that none of yellowcog's devices provide this termination resistor so if you are connecting to a unused CAN port on a logger you must check if the logger can either be configured to provide the appropriate resistance or provide one yourself.
IMPORTANT: if you do not know the full specification of a CAN bus then any device, including all yellowcog devices, can cause the bus to fail.