EZ-Serial Ping Test The Ping Test will connect to a device over the PUART and issue a system_ping command. It verifies communication both ways in the link. Setup Connect the IF820 board to a PC via USB. See Determine COM Port for information on determining the PUART COM Port number and PUART settings. Ping Test Once the PUART is opened in the terminal program type /ping in the window. When the EZ-Serial device receives this command, it will respond with something similar to: @R,001D,/PING,0000,R=000005D0,F=B568.