scanimage -d teco2:/dev/scanner
[sanei_debug] Setting debug level of teco2 to 128.
[teco2] sane_init
[teco2] This is sane-teco version 1.0-1
[teco2] (C) 2002 by AUTHORNAME
[teco2] attach_scanner: /dev/scanner
[teco2] teco_init: enter
[teco2] teco_init: exit
[teco2] attach_scanner: opening /dev/scanner
[teco2] teco_identify_scanner: enter
[teco2] inquiry
[teco2] 000: 06 00 02 02 43 00 00 00 20 20 20 20 20 20 20 20
[teco2] 016: 46 6c 61 74 62 65 64 20 53 63 61 6e 6e 65 72 20
[teco2] 032: 31 2e 30 33 31 2e 30 33 00 01 54 45 43 4f 20 56
[teco2] 048: 4d 33 35 37 35 20 00 01 01 2c 00 01 02 58 09 f6
[teco2] 064: 0d af 01 2c 00 08 01 00
[teco2] device is "        " "Flatbed Scanner " "1.03" "TECO VM3575"
[teco2] teco_identify_scanner: scanner supported
[teco2] teco_close: enter
[teco2] teco_close: exit
[teco2] attach_scanner: exit
[teco2] sane_open: enter
[teco2] sane_open: devicename=/dev/scanner
[teco2] sane_control_option: enter, option 2, action 1
[teco2] sane_open: exit
[teco2] sane_control_option: enter, option 0, action 0
[teco2] sane_control_option: enter, option 0, action 0
[teco2] sane_get_option_descriptor: enter, option 0
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 1
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 2
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 3
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 4
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 5
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 6
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 7
[teco2] sane_get_option_descriptor: exit
[teco2] sane_control_option: enter, option 7, action 0
[teco2] sane_get_option_descriptor: enter, option 8
[teco2] sane_get_option_descriptor: exit
[teco2] sane_control_option: enter, option 8, action 0
[teco2] sane_get_option_descriptor: enter, option 9
[teco2] sane_get_option_descriptor: exit
[teco2] sane_get_option_descriptor: enter, option 10
[teco2] sane_get_option_descriptor: exit
[teco2] sane_control_option: enter, option 5, action 0
[teco2] sane_control_option: enter, option 6, action 0
[teco2] sane_control_option: enter, option 5, action 0
[teco2] sane_get_option_descriptor: enter, option 7
[teco2] sane_get_option_descriptor: exit
[teco2] sane_control_option: enter, option 7, action 1
[teco2] sane_control_option: enter, option 6, action 0
[teco2] sane_get_option_descriptor: enter, option 8
[teco2] sane_get_option_descriptor: exit
[teco2] sane_control_option: enter, option 8, action 1
[teco2] sane_start: enter
[teco2] sane_get_parameters: enter
[teco2] sane_get_parameters: exit
[teco2] teco_wait_scanner: enter
[teco2] teco_set_window: enter
[teco2] windows
[teco2] 000: 00 00 00 00 00 00 00 2d 00 00 00 64 00 64 00 00
[teco2] 016: 00 00 00 00 00 00 00 00 09 f5 00 00 0d b5 00 80
[teco2] 032: 00 00 08 00 00 80 00 00 00 00 00 00 00 00 00 00
[teco2] 048: 02 00 00 00 00
[teco2] teco_set_window: exit, status=0
[teco2] get_filled_data_length: enter
[teco2] get_filled_data_length return
[teco2] 000: 00 00 0f 00 00 00 00 14 00 00 00 00 04 92 00 6a
[teco2] 016: 00 00
[teco2] get_filled_data_length: exit, status=0
[teco2] teco_do_calibration: enter

remark, scannermotor made a short noise after that no respone so killed the proces.
scanimage: received signal 2
scanimage: trying to stop scanner
[teco2] sane_cancel: enter
[teco2] do_cancel enter
[teco2] do_cancel exit
[teco2] sane_cancel: exit
Killed