[ntp:questions] Sure GPS - Very High Jitter and Offset

Miroslav Lichvar mlichvar at redhat.com
Mon Aug 15 18:59:23 UTC 2011

On Mon, Aug 15, 2011 at 12:46:04PM -0500, Ken Link wrote:
> Does anyone know of any Linux CLI tools that display (in some way or
> another) the serial control signals received on a serial port?

You can cat the /proc/tty/driver/serial file in a loop and see if the
CD bit is flipping. 

0: uart:16550A port:000003F8 irq:4 tx:1422 rx:184849390 fe:4891 pe:31 RTS|DTR|CD

Miroslav Lichvar

More information about the questions mailing list