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 | -------------------------------------------------------------------------