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As serial devices have the "dialout" rw group permissions:
$ l /dev/tty[A-Z]*
crw-rw---- 1 root dialout 166, 0 oct. 17 09:15 /dev/ttyACM0
crw-rw---- 1 root dialout 4, 64 oct. 14 01:07 /dev/ttyS0
crw-rw---- 1 root dialout 4, 65 oct. 7 06:40 /dev/ttyS1
crw-rw---- 1 root dialout 4, 66 oct. 7 06:40 /dev/ttyS2
crw-rw---- 1 root dialout 4, 67 oct. 7 06:40 /dev/ttyS3
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