Hi again, sorry for the delay. Here the protocol of the iOptronV3 driver with a different USB cable. I see basically the same timeout errors:

INFO 33.474740 sec : Session log file /home/ralf/.indi/logs/2020-06-11/indi_ioptronv3_telescope/indi_ioptronv3_telescope_21:29:59.log
DEBUG 42.901736 sec : Connecting to /dev/ttyUSB0
DEBUG 42.909591 sec : Port FD 4
DEBUG 42.909651 sec : Connection successful, attempting handshake...
DEBUG 42.909714 sec : Initializing IOptron using :MountInfo# CMD...
DEBUG 42.909766 sec : CMD <:MountInfo#>
DEBUG 42.930647 sec : RES <0043>
INFO 42.930740 sec : iOptron v3 is online.
DEBUG 42.931583 sec : Configuration successfully saved.
DEBUG 42.933087 sec : Configuration successfully saved for DEVICE_BAUD_RATE.
DEBUG 42.935338 sec : Configuration successfully saved for CONNECTION_MODE.
DEBUG 42.947621 sec : Getting firmware data...
DEBUG 42.947683 sec : CMD <:MountInfo#>
DEBUG 42.978968 sec : RES <0043>
DEBUG 42.979083 sec : CMD <:FW1#>
DEBUG 43.010722 sec : RES <191018200113>
DEBUG 43.010836 sec : CMD <:FW2#>
DEBUG 43.026720 sec : RES <190722190722>
DEBUG 43.026857 sec : Getting guiding rate...
DEBUG 43.026879 sec : CMD <:AG#>
DEBUG 43.058645 sec : RES <5050>
DEBUG 43.058770 sec : CMD <:GUT#>
ERROR 48.061629 sec : Read Command Error: Timeout error
DEBUG 48.062702 sec : CMD <:GLS#>
DEBUG 48.084769 sec : RES <+032670500252100521>
INFO 48.084901 sec : Mount Location: Lat -82:59:50 - Long 9:04:30
DEBUG 48.086945 sec : Configuration successfully saved for GEOGRAPHIC_COORD.
INFO 48.087162 sec : InitPark: No Park data in file /home/ralf/.indi/ParkData.xml: No such file or directory
INFO 48.087315 sec : Mount is unparked.
DEBUG 48.087694 sec : Setting Park Axis1 to 14.88
DEBUG 48.088003 sec : Setting Park Axis2 to -90.00
DEBUG 48.088045 sec : Setting Default Park Axis1 to 14.88
DEBUG 48.088070 sec : Setting Default Park Axis2 to -90.00
DEBUG 48.088110 sec : CMD <:GLS#>
DEBUG 48.116150 sec : RES <+032670500252100521>
ERROR 53.118508 sec : Read Command Error: Timeout error
DEBUG 53.119897 sec : CMD <:SUT0645183041999#>
ERROR 58.121465 sec : Read Command Error: Timeout error
DEBUG 58.122482 sec : CMD <:SG+120#>
DEBUG 58.135896 sec : RES <1>
DEBUG 58.136085 sec : CMD <:SLO+03330000#>
DEBUG 58.168138 sec : RES <1>
DEBUG 58.168255 sec : CMD <:SLA+17567892#>
DEBUG 58.199875 sec : RES <1>
INFO 58.199991 sec : Site location updated to Lat 48:47:59 - Long 9:15:00
DEBUG 58.209456 sec : Configuration successfully saved for GEOGRAPHIC_COORD.
DEBUG 58.209917 sec : CMD <:GLS#>
DEBUG 58.231976 sec : RES <+032670500252100511>
ERROR 63.235809 sec : Read Command Error: Timeout error
DEBUG 64.237704 sec : CMD <:GLS#>
DEBUG 64.267009 sec : RES <+032670500252100521>
ERROR 69.272739 sec : Read Command Error: Timeout error
DEBUG 70.273404 sec : CMD <:GLS#>
DEBUG 70.300891 sec : RES <+032670500252100521>
ERROR 75.305410 sec : Read Command Error: Timeout error
DEBUG 76.306676 sec : CMD <:GLS#>
DEBUG 76.334666 sec : RES <+032670500252100521>
ERROR 81.337987 sec : Read Command Error: Timeout error
DEBUG 82.339198 sec : CMD <:GLS#>
DEBUG 82.369637 sec : RES <+032670500252100521>
ERROR 87.375265 sec : Read Command Error: Timeout error
DEBUG 88.376473 sec : CMD <:GLS#>
DEBUG 88.403837 sec : RES <+032670500252100521>
ERROR 93.409522 sec : Read Command Error: Timeout error
DEBUG 94.409986 sec : CMD <:GLS#>
DEBUG 94.437430 sec : RES <+032670500252100521>
ERROR 99.438339 sec : Read Command Error: Timeout error
DEBUG 100.439562 sec : CMD <:GLS#>
DEBUG 100.472708 sec : RES <+032670500252100521>
ERROR 105.476092 sec : Read Command Error: Timeout error
DEBUG 106.476931 sec : CMD <:GLS#>
DEBUG 106.506602 sec : RES <+032670500252100521>
ERROR 111.509331 sec : Read Command Error: Timeout error
DEBUG 112.510628 sec : CMD <:GLS#>
DEBUG 112.540085 sec : RES <+032670500252100521>
ERROR 117.542463 sec : Read Command Error: Timeout error
DEBUG 118.543696 sec : CMD <:GLS#>
DEBUG 118.559010 sec : RES <+032670500252100521>
ERROR 123.559598 sec : Read Command Error: Timeout error
DEBUG 124.560842 sec : CMD <:GLS#>
DEBUG 124.593254 sec : RES <+032670500252100521>
ERROR 129.599004 sec : Read Command Error: Timeout error
DEBUG 130.600282 sec : CMD <:GLS#>
DEBUG 130.626848 sec : RES <+032670500252100521>
ERROR 135.630536 sec : Read Command Error: Timeout error
DEBUG 136.631785 sec : CMD <:GLS#>
DEBUG 136.661757 sec : RES <+032670500252100521>
ERROR 141.665754 sec : Read Command Error: Timeout error
DEBUG 142.667607 sec : CMD <:GLS#>
DEBUG 142.697975 sec : RES <+032670500252100521>
ERROR 147.703244 sec : Read Command Error: Timeout error
DEBUG 148.705136 sec : CMD <:GLS#>
DEBUG 148.730840 sec : RES <+032670500252100521>
ERROR 153.733406 sec : Read Command Error: Timeout error
DEBUG 154.734604 sec : CMD <:GLS#>
DEBUG 154.764399 sec : RES <+032670500252100521>
ERROR 159.769741 sec : Read Command Error: Timeout error
DEBUG 160.771778 sec : CMD <:GLS#>
DEBUG 160.798341 sec : RES <+032670500252100521>
ERROR 165.803645 sec : Read Command Error: Timeout error
INFO 165.808538 sec : iOptron v3 is offline.

The dmesg -T comand does not show any additional problems after above log was created:

[Do Jun 11 23:29:20 2020] usb 2-1: new full-speed USB device number 11 using uhci_hcd
[Do Jun 11 23:29:20 2020] usb 2-1: New USB device found, idVendor=0403, idProduct=6015
[Do Jun 11 23:29:20 2020] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[Do Jun 11 23:29:20 2020] usb 2-1: Product: FT230X Basic UART
[Do Jun 11 23:29:20 2020] usb 2-1: Manufacturer: FTDI
[Do Jun 11 23:29:20 2020] usb 2-1: SerialNumber: D306SGN1
[Do Jun 11 23:29:20 2020] ftdi_sio 2-1:1.0: FTDI USB Serial Device converter detected
[Do Jun 11 23:29:20 2020] usb 2-1: Detected FT-X
[Do Jun 11 23:29:20 2020] usb 2-1: FTDI USB Serial Device converter now attached to ttyUSB0

In my case the indiserver comand shows a rather old version!

2020-06-11T21:38:40: startup: indiserver
Usage: indiserver [options] driver [driver ...]
Purpose: server for local and remote INDI drivers
INDI Library: 1.7.6
Code 1.7.6-tgz. Protocol 1.7.

How can I update to 1.8.6? My version 1.7.6 comes with the Ubuntu stable version installation.

Ralf

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