USB-reset changes /dev/ttyUSB0 to /dev/ttyUSB1

[Per Edström]

This is probably related to my HW i.e. the Ebox3350 and the RS232-to-USB-unit )PL2303). But maybe other Weewx-users have experienced a change in USB-device?

Questions:
- Why is the USB reset?
- Why does it change device number?
- Is there any way to lock the PL2303 to /dev/ttyUSB0 so it doesn't change?

After a reboot it is back to /dev/ttyUSB0

"
Dec 28 03:49:14 Ebox3350 kernel: [43641.405860] usb 1-2.3: input irq status -75  received
Dec 28 03:49:16 Ebox3350 weewx[3202]: wmr9x8: Received WMR9x8 data packet.
Dec 28 03:49:19 Ebox3350 kernel: [43646.533834] usb 1-2.3: input irq status -75  received
Dec 28 03:49:24 Ebox3350 kernel: [43651.465190] usb 1-2: USB disconnect, address 2
Dec 28 03:49:24 Ebox3350 kernel: [43651.465211] usb 1-2.1: USB disconnect, address 3
Dec 28 03:49:24 Ebox3350 kernel: [43651.465929] usb 1-2.3: USB disconnect, address 4
Dec 28 03:49:24 Ebox3350 kernel: [43651.485257] usb 1-2.4: USB disconnect, address 5
Dec 28 03:49:24 Ebox3350 kernel: [43651.485679] usb 1-2: clear tt 4 (9053) error -19
Dec 28 03:49:24 Ebox3350 kernel: [43651.527638] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
Dec 28 03:49:24 Ebox3350 kernel: [43651.527996] pl2303 1-2.4:1.0: device disconnected
Dec 28 03:49:24 Ebox3350 kernel: [43651.817456] usb 1-2: new high speed USB device using ehci_hcd and address 6
Dec 28 03:49:24 Ebox3350 kernel: [43651.941412] usb 1-2: New USB device found, idVendor=1a40, idProduct=0101
Dec 28 03:49:24 Ebox3350 kernel: [43651.941436] usb 1-2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
Dec 28 03:49:24 Ebox3350 kernel: [43651.941453] usb 1-2: Product: USB 2.0 Hub [MTT]
Dec 28 03:49:24 Ebox3350 kernel: [43651.946294] hub 1-2:1.0: USB hub found
Dec 28 03:49:24 Ebox3350 kernel: [43651.946695] hub 1-2:1.0: 4 ports detected
Dec 28 03:49:24 Ebox3350 kernel: [43652.214202] usb 1-2.1: new full speed USB device using ehci_hcd and address 7
Dec 28 03:49:24 Ebox3350 kernel: [43652.304159] usb 1-2.1: New USB device found, idVendor=1781, idProduct=0c31
Dec 28 03:49:24 Ebox3350 kernel: [43652.304183] usb 1-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Dec 28 03:49:24 Ebox3350 kernel: [43652.304200] usb 1-2.1: Product: TellStick Duo
Dec 28 03:49:24 Ebox3350 kernel: [43652.304213] usb 1-2.1: Manufacturer: Telldus
Dec 28 03:49:24 Ebox3350 kernel: [43652.304226] usb 1-2.1: SerialNumber: A501IW2P
Dec 28 03:49:25 Ebox3350 kernel: [43652.380956] usb 1-2.3: new low speed USB device using ehci_hcd and address 8
Dec 28 03:49:25 Ebox3350 kernel: [43652.510039] usb 1-2.3: New USB device found, idVendor=051d, idProduct=0002
Dec 28 03:49:25 Ebox3350 kernel: [43652.510062] usb 1-2.3: New USB device strings: Mfr=3, Product=1, SerialNumber=2
Dec 28 03:49:25 Ebox3350 kernel: [43652.510080] usb 1-2.3: Product: Back-UPS ES 700 FW:829.D2 .I USB FW:D2
Dec 28 03:49:25 Ebox3350 kernel: [43652.510096] usb 1-2.3: Manufacturer: APC
Dec 28 03:49:25 Ebox3350 kernel: [43652.510109] usb 1-2.3: SerialNumber: 5B0823T19645
Dec 28 03:49:25 Ebox3350 kernel: [43652.864594] generic-usb 0003:051D:0002.0002: hiddev96,hidraw0: USB HID v1.10 Device [APC Back-UPS ES 700 FW:829.D2 .I USB FW:D2 ] on usb-0000:00:0a.1-2.3/input0
Dec 28 03:49:25 Ebox3350 kernel: [43652.940824] usb 1-2.4: new full speed USB device using ehci_hcd and address 9
Dec 28 03:49:25 Ebox3350 kernel: [43653.025405] usb 1-2.4: New USB device found, idVendor=067b, idProduct=2303
Dec 28 03:49:25 Ebox3350 kernel: [43653.025428] usb 1-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Dec 28 03:49:25 Ebox3350 kernel: [43653.025446] usb 1-2.4: Product: USB-Serial Controller D
Dec 28 03:49:25 Ebox3350 kernel: [43653.025460] usb 1-2.4: Manufacturer: Prolific Technology Inc.
Dec 28 03:49:25 Ebox3350 kernel: [43653.031091] pl2303 1-2.4:1.0: pl2303 converter detected
Dec 28 03:49:25 Ebox3350 kernel: [43653.034439] usb 1-2.4: pl2303 converter now attached to ttyUSB1
Dec 28 03:49:25 Ebox3350 kernel: [43653.119773] usb 1-2.3: input irq status -75  received
Dec 28 03:49:26 Ebox3350 modem-manager: (ttyUSB1) opening serial device...
Dec 28 03:49:26 Ebox3350 modem-manager: (ttyUSB1): probe requested by plugin 'Generic'
Dec 28 03:49:29 Ebox3350 kernel: [43656.783741] usb 1-2.3: input irq status -75  received
Dec 28 03:49:34 Ebox3350 kernel: [43661.911701] usb 1-2.3: input irq status -75  received
Dec 28 03:49:38 Ebox3350 modem-manager: (ttyUSB1) closing serial device...

[vince]

google for "usb device number changes linux" - there are a 'lot' of links that come up.

Impossible to say much more without knowing what os you are running.

[Thomas Keffer]

The User Manual has a discussion about this in the context of the Vantage driver, but the same fix can be used for other hardware.

-tk

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