ICP DAS USA M-4132 User Manual page 68

Step 3: Confirm that the Com Port devices is connected with Server
and Client has the same communication settings with
Server's "Operation Mode" page. If it is different, please
break the connection and change the settings then reconnect
the client.
Server's "Operation Mode" page
Step 4: Confirm the Cable connected Server/Client to Com Port
device is wired correctly. If the connection is RS485, the user
M-4132 User Manual (Version 1.60, May/2014) PAGE：68