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+--- Thread: Can't enable RTU 3 Port | Error: RTU (serial) is not enabled (/showthread.php?tid=6126)
Can't enable RTU 3 Port | Error: RTU (serial) is not enabled - andrecosta - 24.09.2025
Hello Guys,
I have an LM5p2-KC with 20240426 firmware version (LM5 Lite + Ext (i.MX6)) in witch I can't enable RTU 3 Port.
I go to RTU Settings and I check the box that says "RTU 3 - RTU (serial) enabled:" but when I save that settings and I go again to RTU Settings, the box remain unchecked. I have tried several times but it's always happening the same thing.
After that if I try to add a Modbus device in RTU 3 Port I get an error that says "RTU (serial) is not enabled".
I'm attaching some print screens here.
Can you help me with this?
Thank you.
RE: Can't enable RTU 3 Port | Error: RTU (serial) is not enabled - admin - 24.09.2025
See if RS485-3 is listed in System config > Status > System status > Serial ports
Check this: https://forum.logicmachine.net/showthread.php?tid=5907
RE: Can't enable RTU 3 Port | Error: RTU (serial) is not enabled - andrecosta - 24.09.2025
No, it's not. But I already have used this RTU 3 Port of this specific LM in the past and with this firmware version.
What can I do?
RE: Can't enable RTU 3 Port | Error: RTU (serial) is not enabled - admin - 24.09.2025
Check the thread that I've linked above for a solution.
RE: Can't enable RTU 3 Port | Error: RTU (serial) is not enabled - andrecosta - 24.09.2025
(24.09.2025, 11:31)admin Wrote: Check the thread that I've linked above for a solution.
It worked!
Thanks.