Can transceiver monitor

A Controller Area Network (CAN) Transceiver monitor comprising:

• two CAN inputs including CAN H input and CAN L input;
• two CAN outputs including CAN H output and CAN L output;
• a CAN type selector;
• a test enable port;
• at least a test circuit, an ACK detection circuit and an ACK response circuit;
• the CAN Transceiver monitor is configured to install in series in a CAN bus line comprising a CAN H line and a CAN L line, after a CAN transceiver;
• wherein
• the test enable port is configured to enable the monitor to perform in-line and real time testing of the two CAN inputs while ensuring continuous and uninterrupted data flow of the two CAN inputs to the two CAN outputs,
• the CAN H input, the CAN L input, the CAN H output and the CAN L output are part of a CAN bus line and are required to decipher transmitted CAN data frames as well as to ensure transmission of said data frames to the CAN bus line in case of no test operation,
• the test enable port is configured to highjack the data frames for testing purposes or, by default, to propagate the data frames present on the two CAN input signals to the CAN bus line, wherein a test circuit comprises electronic and additional logic circuits configured to commute between a testing mode and a default operation mode,
• a ACK detection circuit comprises logic circuits configured to determine a position of an ACK bit within a CAN data frame, and
• the ACK response circuit is configured to output an ACK bit of a CAN data frame in the CAN bus line for a set duration of time.