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+--- Thread: Modbus RS485 using USB Dongle (/showthread.php?tid=5833)
Modbus RS485 using USB Dongle - jmir - 13.01.2025
Hi,
I'm using a USB Dongle as modbus RTU3, it's working fine but when I unplug the dongle and connect again the port name switches form " /dev/ttyUSB0" to "/dev/ttyUSB1"...
Is there any way to fix the port name? When it happens the only way to make it working again is rebooting LM...
RE: Modbus RS485 using USB Dongle - jmir - 15.01.2025
(13.01.2025, 09:23)jmir Wrote: Hi,
I'm using a USB Dongle as modbus RTU3, it's working fine but when I unplug the dongle and connect again the port name switches form " /dev/ttyUSB0" to "/dev/ttyUSB1"...
Is there any way to fix the port name? When it happens the only way to make it working again is rebooting LM...
Is there any way to solve it?
RE: Modbus RS485 using USB Dongle - admin - 15.01.2025
USB is not a reliable solution. It can disconnect randomly due to electromagnetic noise presence. If you need more ports consider using LM5 DR. Alternatively you can use a third-party Modbus RTU-TCP gateway.
RE: Modbus RS485 using USB Dongle - jmir - 15.01.2025
(15.01.2025, 11:39)admin Wrote: USB is not a reliable solution. It can disconnect randomly due to electromagnetic noise presence. If you need more ports consider using LM5 DR. Alternatively you can use a third-party Modbus RTU-TCP gateway.
Ok thanks!
RE: Modbus RS485 using USB Dongle - JRP - 21.01.2025
Hola
When I experiment with other equipment (no LM, no SE), such as SBC and Zigbee USB dongles, I always recommend using a USB cable extender to connect it to the equipment.
Quiz your sea of use.
Greetings.