Port-amd64 archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: serial console and panic

Thomas E. Spanjaard <tgen%deepbone.net@localhost> wrote:

If there is an earthing potential difference between the two machines
connected with a serial (RS232/null-modem) cable, the resulting
(mini-)surge will be interpreted as a break signal. You can prevent it
by using special cables or wiring a resistor between the ground
connections (iirc).

Back in the old days, we used optical isolators for just this reason.

|   Paul Goyette   | PGP DSS Key fingerprint: |  E-mail addresses:      |
| Customer Service | FA29 0E3B 35AF E8AE 6651 |  paul at whooppee.com   |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
| Kernel Developer |                          | pgoyette at netbsd.org  |

Home | Main Index | Thread Index | Old Index