The MAX20340 Master can not automatically detect that a Slave has been disconnected. It has to periodically ping the slave to determine whether it is connected. To implement this, the host processor communicating with MAX20340 Master must command the Master to Transmit a byte to the Slave. As soon as the Master sends a byte to the Slave, the Master starts its RX Wait Timer, waiting for a response from the Slave. If the Slave is disconnected, the Master will not get any response from the Slave, so the RX Wait Timer expires. When this happens, the host processor can conclude that no Slave is present. To ensure that the RX Wait Timer does not expire while the slave is connected, the Slave side host processor also needs to be setup such that it sends a byte back to the Master as soon as it receives a byte from the Master.