text: <s>[INST] PowerFlex 400, RS 485 not functional Hi! I'm interfacing 3x PowerFlex 400 in a Modbus network over RS485 for remote supervision & control 2 of 3 Drives communicate OK via RS485 with no problems! Only one of the Drives is not communicating at all! It seams that one of the RS485 drivers (the chip) is not functioning. How can I troubleshoot the RS485 interface? Or, where is the RS485 chip? Thanks in advance! [/INST] I would configure the connection for only one drive, then test every single drive and see... remember to reset at default every drive and then configure all with the same parameters. - fuzzy logic Please remember to Rate the Comments( ) to enhance the reputation of the User who provided help,or close your Topic using the ( ) button over the answer that solved it. Thanks... \\n </s>