Hi Peter,
here is the output focused on the ttyS0 part
crw-rw---- 1 root root 249, 0 Jan 1 00:03 ttyGS0
crw-rw---- 1 root root 252, 0 Jan 1 00:00 ttyQRK0
crw------- 1 root tty 252, 1 Jan 1 01:36 ttyQRK1
crw-rw---- 1 root root 4, 64 Jan 1 00:00 ttyS0
crw-rw---- 1 root root 4, 65 Jan 1 00:00 ttyS1
when I try your suggention, it works as expected!:
thank you,
tiago