StarTech.com ECS0016 manual Raw Access to Serial Ports, Accessing the Console Port

Instruction Manual

Raw Access to Serial Ports

Access to Serial Ports

You can tip and stty to completely bypass the portmanager and have raw access to the serial ports.

When you run tip on a portmanager controlled port, portmanager closes that port, and stops monitoring it until tip releases control of it.

With stty, the changes made to the port only “stick” until that port is closed and opened again, so it is doubtful that people will want to use stty for more than initial debugging of the serial connection.

If you want to use stty to configure the port, you can put stty commands in /etc/config/scripts/portXX.init, which gets run whenever portmanager opens the port.

Otherwise, any setup you do with stty will get lost when the portmanager opens the port (the reason that portmanager sets things back to its config rather than using whatever is on the port, is so the port is in a known good state, and will work, no matter what things are done to the serial port outside of portmanager).

Accessing the Console Port

The console dial-in is handled by mgetty, with automatic PPP login extensions. mgetty is a smart getty replacement, designed to be used with Hayes compatible data and data/fax modems. mgetty knows about modem initialization, manual modem answering (so your modem doesn’t answer if the machine isn’t ready), UUCP locking (so you can use the same device for dial-in and dial-out). mgetty provides very extensive logging facilities. All standard mgetty options are supported.

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